diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 4bf4e13..c74fb75 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,6 +8,11 @@ updates:
       - "dependencies"
       - "rust"
       - "skip changelog"
+    groups:
+      libcnb:
+        patterns:
+          - "libcnb*"
+          - "libherokubuildpack"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 55bc9a3..ce36991 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Update Rust toolchain
         run: rustup update
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.5.0
+        uses: Swatinem/rust-cache@v2.5.1
       - name: Clippy
         run: cargo clippy --all-targets --locked -- --deny warnings
       - name: rustfmt
@@ -36,7 +36,7 @@ jobs:
       - name: Update Rust toolchain
         run: rustup update
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.5.0
+        uses: Swatinem/rust-cache@v2.5.1
       - name: Run unit tests
         run: cargo test --locked
 
@@ -58,9 +58,9 @@ jobs:
       - name: Install Rust linux-musl target
         run: rustup target add x86_64-unknown-linux-musl
       - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.5.0
+        uses: Swatinem/rust-cache@v2.5.1
       - name: Install Pack CLI
-        uses: buildpacks/github-actions/setup-pack@v5.2.0
+        uses: buildpacks/github-actions/setup-pack@v5.3.0
       - name: Pull builder image
         run: docker pull ${{ env.INTEGRATION_TEST_CNB_BUILDER }}
       # The integration tests are annotated with the `ignore` attribute, allowing us to run
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 007939f..238d071 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,14 +2,23 @@
 
 All notable changes to this project will be documented in this file.
 
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+### Removed
+
+- Removed support for Salesforce Functions. ([#83](https://github.com/heroku/buildpacks-python/pull/83))
+
+## [0.5.0] - 2023-07-24
+
 ### Changed
 
+- User-provided environment variables are now propagated to subprocesses such as `pip install`. ([#65](https://github.com/heroku/buildpacks-python/pull/65))
+- Updated pip from 23.1.2 to 23.2.1. ([#67](https://github.com/heroku/buildpacks-python/pull/67) and [#76](https://github.com/heroku/buildpacks-python/pull/76))
 - Updated setuptools from 67.8.0 to 68.0.0. ([#51](https://github.com/heroku/buildpacks-python/pull/51))
+- Updated wheel from 0.40.0 to 0.41.0. ([#78](https://github.com/heroku/buildpacks-python/pull/78))
 
 ## [0.4.0] - 2023-06-07
 
@@ -37,10 +46,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-- The `PYTHONHOME` environment variable is now set to work around uWSGI not handling relocated Python installs correctly. ([#25](https://github.com/heroku/buildpacks-python/pull/25))
+- The `PYTHONHOME` environment variable is now set, to work around uWSGI not handling relocated Python installs correctly. ([#25](https://github.com/heroku/buildpacks-python/pull/25))
 
 ## [0.1.0] - 2023-03-06
 
 ### Added
 
 - Initial implementation. ([#3](https://github.com/heroku/buildpacks-python/pull/3))
+
+[unreleased]: https://github.com/heroku/buildpacks-python/compare/v0.5.0...HEAD
+[0.5.0]: https://github.com/heroku/buildpacks-python/compare/v0.4.0...v0.5.0
+[0.4.0]: https://github.com/heroku/buildpacks-python/compare/v0.3.0...v0.4.0
+[0.3.0]: https://github.com/heroku/buildpacks-python/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/heroku/buildpacks-python/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/heroku/buildpacks-python/releases/tag/v0.1.0
diff --git a/Cargo.lock b/Cargo.lock
index 6d2ccc0..460ba66 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,12 +2,30 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "addr2line"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4fa78e18c64fce05e902adecd7a5eed15a5e0a3439f7b0e169f0252214865e3"
+dependencies = [
+ "gimli",
+]
+
 [[package]]
 name = "adler"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aho-corasick"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43f6cb1bf222025340178f382c426f13757b2960e89779dfcb319c32542a5a41"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
@@ -29,6 +47,21 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "backtrace"
+version = "0.3.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4319208da049c43661739c5fade2ba182f09d1dc2299b32298d3a31692b17e12"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
 [[package]]
 name = "base64"
 version = "0.13.1"
@@ -62,6 +95,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "bitflags"
+version = "2.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "630be753d4e58660abd17930c71b647fe46c27ea6b63cc59e1e3851406972e42"
+
 [[package]]
 name = "bollard"
 version = "0.14.0"
@@ -115,18 +154,18 @@ checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
 
 [[package]]
 name = "camino"
-version = "1.1.4"
+version = "1.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c530edf18f37068ac2d977409ed5cd50d53d73bc653c7647b48eb78976ac9ae2"
+checksum = "c59e92b5a388f549b863a7bea62612c09f24c8393560709a54558a9abdfb3b9c"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "cargo-platform"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cbdb825da8a5df079a43676dbe042702f1707b1109f713a01420fbb4cc71fa27"
+checksum = "2cfa25e60aea747ec7e1124f238816749faa93759c6ff5b31f1ccdda137f4479"
 dependencies = [
  "serde",
 ]
@@ -185,23 +224,32 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "deranged"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8810e7e2cf385b1e9b50d68264908ec367ba642c96d02edfe61c39e88e2a3c01"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "either"
-version = "1.8.1"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
 [[package]]
 name = "equivalent"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88bffebc5d80432c9b140ee17875ff173a8ab62faad5b257da912bd2f6c1c0a1"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
 [[package]]
 name = "errno"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
+checksum = "6b30f669a7961ef1631673d2766cc92f52d64f7ef354d4fe0ddfd30ed52f0f4f"
 dependencies = [
  "errno-dragonfly",
  "libc",
@@ -228,15 +276,6 @@ dependencies = [
  "regex",
 ]
 
-[[package]]
-name = "fastrand"
-version = "1.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be"
-dependencies = [
- "instant",
-]
-
 [[package]]
 name = "fastrand"
 version = "2.0.0"
@@ -345,6 +384,12 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.27.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6c80984affa11d98d1b88b66ac8853f143217b399d3c74116778ff8fdb4ed2e"
+
 [[package]]
 name = "h2"
 version = "0.3.20"
@@ -378,18 +423,9 @@ checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
 
 [[package]]
 name = "hermit-abi"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee512640fe35acbfb4bb779db6f0d80704c2cacfa2e39b601ef3e3f47d1ae4c7"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "hermit-abi"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
 
 [[package]]
 name = "hex"
@@ -433,9 +469,9 @@ checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
 
 [[package]]
 name = "hyper"
-version = "0.14.26"
+version = "0.14.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab302d72a6f11a3b910431ff93aae7e773078c769f0a3ef15fb9ec692ed147d4"
+checksum = "ffb1cfd654a8219eaef89881fdb3bb3b1cdc5fa75ded05d6933b2b382e395468"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -524,35 +560,15 @@ dependencies = [
 
 [[package]]
 name = "indoc"
-version = "2.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f2cb48b81b1dc9f39676bf99f5499babfec7cd8fe14307f7b3d747208fb5690"
-
-[[package]]
-name = "instant"
-version = "0.1.12"
+version = "2.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
-dependencies = [
- "cfg-if",
-]
-
-[[package]]
-name = "io-lifetimes"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eae7b9aee968036d54dce06cebaefd919e4472e753296daccd6d344e3e2df0c2"
-dependencies = [
- "hermit-abi 0.3.1",
- "libc",
- "windows-sys",
-]
+checksum = "2c785eefb63ebd0e33416dfcb8d6da0bf27ce752843a45632a67bf10d4d4b5c4"
 
 [[package]]
 name = "itoa"
-version = "1.0.6"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "js-sys"
@@ -635,7 +651,7 @@ checksum = "0b41b862dfd56b90b266cc5eeb7387bbe1d7912f713af70d988bc9a52d7fe935"
 dependencies = [
  "bollard",
  "cargo_metadata",
- "fastrand 2.0.0",
+ "fastrand",
  "fs_extra",
  "libcnb-data",
  "libcnb-package",
@@ -656,9 +672,9 @@ dependencies = [
 
 [[package]]
 name = "libz-sys"
-version = "1.1.9"
+version = "1.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56ee889ecc9568871456d42f603d6a0ce59ff328d291063a45cbdf0036baf6db"
+checksum = "d97137b25e321a73eef1418d1d5d2eda4d77e12813f8e6dead84bc52c5870a7b"
 dependencies = [
  "cc",
  "pkg-config",
@@ -667,9 +683,9 @@ dependencies = [
 
 [[package]]
 name = "linux-raw-sys"
-version = "0.3.8"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef53942eb7bf7ff43a617b3e2c1c4a5ecf5944a7c1bc12d7ee39bbb15e5c1519"
+checksum = "09fc20d2ca12cb9f044c93e3bd6d32d523e6e2ec3db4f7b2939cd99026ecd3f0"
 
 [[package]]
 name = "log"
@@ -705,23 +721,32 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "f30b0abd723be7e2ffca1272140fac1a2f084c77ec3e123c192b66af1ee9e6c2"
 dependencies = [
  "autocfg",
 ]
 
 [[package]]
 name = "num_cpus"
-version = "1.15.0"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fac9e2da13b5eb447a6ce3d392f23a29d8694bff781bf03a16cd9ac8697593b"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi 0.2.6",
+ "hermit-abi",
  "libc",
 ]
 
+[[package]]
+name = "object"
+version = "0.31.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8bda667d9f2b5051b8833f59f3bf748b28ef54f850f4fcb389a252aa383866d1"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.18.0"
@@ -746,18 +771,18 @@ dependencies = [
 
 [[package]]
 name = "pin-project"
-version = "1.1.0"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c95a7476719eab1e366eaf73d0260af3021184f18177925b07f54b30089ceead"
+checksum = "030ad2bc4db10a8944cb0d837f158bdfec4d4a4873ab701a95046770d11f8842"
 dependencies = [
  "pin-project-internal",
 ]
 
 [[package]]
 name = "pin-project-internal"
-version = "1.1.0"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39407670928234ebc5e6e580247dd567ad73a3578460c5990f9503df207e8f07"
+checksum = "ec2e072ecce94ec471b13398d5402c188e76ac03cf74dd1a975161b23a3f6d9c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -766,9 +791,9 @@ dependencies = [
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
+checksum = "4c40d25201921e5ff0c862a505c6557ea88568a4e3ace775ab55e93f2f4f9d57"
 
 [[package]]
 name = "pin-utils"
@@ -784,9 +809,9 @@ checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.63"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b368fba921b0dce7e60f5e04ec15e565b3303972b42bcfde1d0713b881959eb"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
@@ -802,15 +827,14 @@ dependencies = [
  "libherokubuildpack",
  "serde",
  "tar",
- "toml",
  "ureq",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.28"
+version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b9ab9c7eadfd8df19006f1cf1a4aed13540ed5cbc047010ece5826e10825488"
+checksum = "50f3b39ccfb720540debaa0164757101c08ecb8d326b15358ce76a62c7e85965"
 dependencies = [
  "proc-macro2",
 ]
@@ -821,7 +845,7 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
 ]
 
 [[package]]
@@ -830,23 +854,37 @@ version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
 ]
 
 [[package]]
 name = "regex"
-version = "1.8.4"
+version = "1.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2eae68fc220f7cf2532e4494aded17545fce192d59cd996e0fe7887f4ceb575"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0ab3ca65655bb1e41f2a8c8cd662eb4fb035e67c3f78da1d61dffe89d07300f"
+checksum = "b7b6d6190b7594385f61bd3911cd1be99dfddcfc365a4160cc2ab5bff4aed294"
 dependencies = [
+ "aho-corasick",
+ "memchr",
  "regex-syntax",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.7.2"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "436b050e76ed2903236f032a59761c1eb99e1b0aead2c257922771dab1fc8c78"
+checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
 
 [[package]]
 name = "ring"
@@ -863,15 +901,20 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "rustc-demangle"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
+
 [[package]]
 name = "rustix"
-version = "0.37.20"
+version = "0.38.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b96e891d04aa506a6d1f318d2771bcb1c7dfda84e126660ace067c9b474bb2c0"
+checksum = "0a962918ea88d644592894bc6dc55acc6c0956488adcebbfb6e273506b7fd6e5"
 dependencies = [
- "bitflags",
+ "bitflags 2.3.3",
  "errno",
- "io-lifetimes",
  "libc",
  "linux-raw-sys",
  "windows-sys",
@@ -879,13 +922,13 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.21.2"
+version = "0.21.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e32ca28af694bc1bbf399c33a516dbdf1c90090b8ab23c2bc24f834aa2247f5f"
+checksum = "79ea77c539259495ce8ca47f53e66ae0330a8819f67e23ac96ca02f50e7b7d36"
 dependencies = [
  "log",
  "ring",
- "rustls-webpki",
+ "rustls-webpki 0.101.2",
  "sct",
 ]
 
@@ -899,11 +942,21 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "rustls-webpki"
+version = "0.101.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "513722fd73ad80a71f72b61009ea1b584bcfa1483ca93949c8f290298837fa59"
+dependencies = [
+ "ring",
+ "untrusted",
+]
+
 [[package]]
 name = "ryu"
-version = "1.0.13"
+version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
+checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
 
 [[package]]
 name = "sct"
@@ -917,27 +970,27 @@ dependencies = [
 
 [[package]]
 name = "semver"
-version = "1.0.17"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bebd363326d05ec3e2f532ab7660680f3b02130d780c299bca73469d521bc0ed"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "serde"
-version = "1.0.164"
+version = "1.0.179"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e8c8cf938e98f769bc164923b06dce91cea1751522f46f8466461af04c9027d"
+checksum = "0a5bf42b8d227d4abf38a1ddb08602e229108a517cd4e5bb28f9c7eaafdce5c0"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.164"
+version = "1.0.179"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9735b638ccc51c28bf6914d90a2e9725b377144fc612c49a611fddd1b631d68"
+checksum = "741e124f5485c7e60c03b043f79f320bff3527f4bbf12cf3831750dc46a0ec2c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -946,9 +999,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.99"
+version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46266871c240a00b8f503b877622fe33430b3c7d963bdc0f2adc511e54a1eae3"
+checksum = "076066c5f1078eac5b722a31827a8832fe108bed65dfa75e233c89f8206e976c"
 dependencies = [
  "itoa",
  "ryu",
@@ -957,9 +1010,9 @@ dependencies = [
 
 [[package]]
 name = "serde_repr"
-version = "0.1.12"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcec881020c684085e55a25f7fd888954d56609ef363479dc5a1305eb0d40cab"
+checksum = "8725e1dfadb3a50f7e5ce0b1a540466f6ed3fe7a0fca2ac2b8b831d31316bd00"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1029,9 +1082,9 @@ checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
 
 [[package]]
 name = "syn"
-version = "2.0.22"
+version = "2.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2efbeae7acf4eabd6bcdcbd11c92f45231ddda7539edc7806bd1a04a03b24616"
+checksum = "04361975b3f5e348b2189d8dc55bc942f278b2d482a6a0365de5bdd62d351567"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1040,24 +1093,22 @@ dependencies = [
 
 [[package]]
 name = "tar"
-version = "0.4.38"
+version = "0.4.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b55807c0344e1e6c04d7c965f5289c39a8d94ae23ed5c0b57aabac549f871c6"
+checksum = "ec96d2ffad078296368d46ff1cb309be1c23c513b4ab0e22a45de0185275ac96"
 dependencies = [
  "filetime",
  "libc",
- "xattr",
 ]
 
 [[package]]
 name = "tempfile"
-version = "3.6.0"
+version = "3.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31c0432476357e58790aaa47a8efb0c5138f137343f3b5f23bd36a27e3b0a6d6"
+checksum = "5486094ee78b2e5038a6382ed7645bc084dc2ec433426ca4c3cb61e2007b8998"
 dependencies = [
- "autocfg",
  "cfg-if",
- "fastrand 1.9.0",
+ "fastrand",
  "redox_syscall 0.3.5",
  "rustix",
  "windows-sys",
@@ -1074,18 +1125,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.40"
+version = "1.0.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "978c9a314bd8dc99be594bc3c175faaa9794be04a5a5e153caba6915336cebac"
+checksum = "611040a08a0439f8248d1990b111c95baa9c704c805fa1f62104b39655fd7f90"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.40"
+version = "1.0.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
+checksum = "090198534930841fab3a5d1bb637cde49e339654e606195f8d9c76eeb081dc96"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1094,10 +1145,11 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.22"
+version = "0.3.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea9e1b3cf1243ae005d9e74085d4d542f3125458f3a81af210d901dcd7411efd"
+checksum = "b79eabcd964882a646b3584543ccabeae7869e9ac32a46f6f22b7a5bd405308b"
 dependencies = [
+ "deranged",
  "itoa",
  "serde",
  "time-core",
@@ -1112,9 +1164,9 @@ checksum = "7300fbefb4dadc1af235a9cef3737cea692a9d97e1b9cbcd4ebdae6f8868e6fb"
 
 [[package]]
 name = "time-macros"
-version = "0.2.9"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "372950940a5f07bf38dbe211d7283c9e6d7327df53794992d293e534c733d09b"
+checksum = "eb71511c991639bb078fd5bf97757e03914361c48100d52878b8e52b46fb92cd"
 dependencies = [
  "time-core",
 ]
@@ -1136,11 +1188,12 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.28.2"
+version = "1.29.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94d7b1cfd2aa4011f2de74c2c4c63665e27a71006b0a192dcd2710272e73dfa2"
+checksum = "532826ff75199d5833b9d2c5fe410f29235e25704ee5f0ef599fb51c21f4a4da"
 dependencies = [
  "autocfg",
+ "backtrace",
  "bytes",
  "libc",
  "mio",
@@ -1177,9 +1230,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.7.5"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ebafdf5ad1220cb59e7d17cf4d2c72015297b75b19a10472f99b89225089240"
+checksum = "c17e963a819c331dcacd7ab957d80bc2b9a9c1e71c804826d2f283dd65306542"
 dependencies = [
  "serde",
  "serde_spanned",
@@ -1198,9 +1251,9 @@ dependencies = [
 
 [[package]]
 name = "toml_edit"
-version = "0.19.11"
+version = "0.19.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "266f016b7f039eec8a1a80dfe6156b633d208b9fccca5e4db1d6775b0c4e34a7"
+checksum = "f8123f27e969974a3dfba720fdb560be359f57b44302d280ba72e76a74480e8a"
 dependencies = [
  "indexmap 2.0.0",
  "serde",
@@ -1249,9 +1302,9 @@ checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.9"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b15811caf2415fb889178633e7724bad2509101cde276048e013b9def5e51fa0"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "unicode-normalization"
@@ -1278,7 +1331,7 @@ dependencies = [
  "log",
  "once_cell",
  "rustls",
- "rustls-webpki",
+ "rustls-webpki 0.100.1",
  "url",
  "webpki-roots",
 ]
@@ -1395,7 +1448,7 @@ version = "0.23.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b03058f88386e5ff5310d9111d53f48b17d732b401aeb83a8d5190f2ac459338"
 dependencies = [
- "rustls-webpki",
+ "rustls-webpki 0.100.1",
 ]
 
 [[package]]
@@ -1460,9 +1513,9 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.48.0"
+version = "0.48.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b1eb6f0cd7c80c79759c929114ef071b87354ce476d9d94271031c0497adfd5"
+checksum = "05d4b17490f70499f20b9e791dcf6a299785ce8af4d709018206dc5b4953e95f"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -1517,18 +1570,9 @@ checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
 
 [[package]]
 name = "winnow"
-version = "0.4.7"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca0ace3845f0d96209f0375e6d367e3eb87eb65d27d445bdc9f1843a26f39448"
+checksum = "8bd122eb777186e60c3fdf765a58ac76e41c582f1f535fbf3314434c6b58f3f7"
 dependencies = [
  "memchr",
 ]
-
-[[package]]
-name = "xattr"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d1526bbe5aaeb5eb06885f4d987bcdfa5e23187055de9b83fe00156a821fabc"
-dependencies = [
- "libc",
-]
diff --git a/Cargo.toml b/Cargo.toml
index 86790b7..8a5143d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,8 +16,7 @@ indoc = "2"
 libcnb = "0.13"
 libherokubuildpack = { version = "0.13", default-features = false, features = ["log"] }
 serde = "1"
-tar = "0.4"
-toml = "0.7"
+tar = { version = "0.4", default-features = false }
 ureq = { version = "2", default-features = false, features = ["tls"] }
 
 [dev-dependencies]
diff --git a/buildpack.toml b/buildpack.toml
index c56de8b..b401acd 100644
--- a/buildpack.toml
+++ b/buildpack.toml
@@ -2,12 +2,11 @@ api = "0.9"
 
 [buildpack]
 id = "heroku/python"
-version = "0.4.0"
+version = "0.5.0"
 name = "Python"
 homepage = "https://github.com/heroku/buildpacks-python"
 description = "Heroku's official Python Cloud Native Buildpack."
 keywords = ["python", "heroku"]
-clear-env = true
 
 [[buildpack.licenses]]
 type = "BSD-3-Clause"
diff --git a/requirements/pip.txt b/requirements/pip.txt
index 240ab1a..0fe1be6 100644
--- a/requirements/pip.txt
+++ b/requirements/pip.txt
@@ -1 +1 @@
-pip==23.1.2
+pip==23.2.1
diff --git a/requirements/wheel.txt b/requirements/wheel.txt
index e8f5aac..1244ba1 100644
--- a/requirements/wheel.txt
+++ b/requirements/wheel.txt
@@ -1 +1 @@
-wheel==0.40.0
+wheel==0.41.0
diff --git a/src/errors.rs b/src/errors.rs
index efdd9f2..8373ffb 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -1,10 +1,8 @@
 use crate::layers::pip_dependencies::PipDependenciesLayerError;
 use crate::layers::python::PythonLayerError;
 use crate::package_manager::DeterminePackageManagerError;
-use crate::project_descriptor::ProjectDescriptorError;
 use crate::python_version::{PythonVersion, PythonVersionError, DEFAULT_PYTHON_VERSION};
 use crate::runtime_txt::{ParseRuntimeTxtError, RuntimeTxtError};
-use crate::salesforce_functions::{CheckSalesforceFunctionError, FUNCTION_RUNTIME_PROGRAM_NAME};
 use crate::utils::{CommandError, DownloadUnpackArchiveError};
 use crate::BuildpackError;
 use indoc::{formatdoc, indoc};
@@ -42,7 +40,6 @@ pub(crate) fn on_error(error: libcnb::Error<BuildpackError>) {
 
 fn on_buildpack_error(error: BuildpackError) {
     match error {
-        BuildpackError::CheckSalesforceFunction(error) => on_check_salesforce_function_error(error),
         BuildpackError::DetectIo(io_error) => log_io_error(
             "Unable to complete buildpack detection",
             "determining if the Python buildpack should be run for this application",
@@ -50,30 +47,11 @@ fn on_buildpack_error(error: BuildpackError) {
         ),
         BuildpackError::DeterminePackageManager(error) => on_determine_package_manager_error(error),
         BuildpackError::PipDependenciesLayer(error) => on_pip_dependencies_layer_error(error),
-        BuildpackError::ProjectDescriptor(error) => on_project_descriptor_error(error),
         BuildpackError::PythonLayer(error) => on_python_layer_error(error),
         BuildpackError::PythonVersion(error) => on_python_version_error(error),
     };
 }
 
-fn on_project_descriptor_error(error: ProjectDescriptorError) {
-    match error {
-        ProjectDescriptorError::Io(io_error) => log_io_error(
-            "Unable to read project.toml",
-            "reading the (optional) project.toml file",
-            &io_error,
-        ),
-        ProjectDescriptorError::Parse(toml_error) => log_error(
-            "Invalid project.toml",
-            formatdoc! {"
-                A parsing/validation error error occurred whilst loading the project.toml file.
-                
-                Details: {toml_error}
-            "},
-        ),
-    };
-}
-
 fn on_determine_package_manager_error(error: DeterminePackageManagerError) {
     match error {
         DeterminePackageManagerError::Io(io_error) => log_io_error(
@@ -239,42 +217,6 @@ fn on_pip_dependencies_layer_error(error: PipDependenciesLayerError) {
     };
 }
 
-fn on_check_salesforce_function_error(error: CheckSalesforceFunctionError) {
-    match error {
-        CheckSalesforceFunctionError::Io(io_error) => log_io_error(
-            "Unable to run the Salesforce Functions self-check command",
-            &format!("running the '{FUNCTION_RUNTIME_PROGRAM_NAME} check' command"),
-            &io_error,
-        ),
-        CheckSalesforceFunctionError::NonZeroExitStatus(output) => log_error(
-            "The Salesforce Functions self-check failed",
-            formatdoc! {"
-                The '{FUNCTION_RUNTIME_PROGRAM_NAME} check' command failed ({exit_status}), indicating
-                there is a problem with the Python Salesforce Function in this project.
-                
-                Details:
-                {stderr}
-                ",
-                exit_status = output.status,
-                stderr = String::from_utf8_lossy(&output.stderr),
-            },
-        ),
-        CheckSalesforceFunctionError::ProgramNotFound => log_error(
-            "The Salesforce Functions package is not installed",
-            formatdoc! {"
-                The '{FUNCTION_RUNTIME_PROGRAM_NAME}' program that is required for Python Salesforce
-                Functions could not be found.
-
-                Check that the 'salesforce-functions' Python package is listed as a
-                dependency in 'requirements.txt'.
-                
-                If this project is not intended to be a Salesforce Function, remove the
-                'type = \"function\"' declaration from 'project.toml' to skip this check.
-            "},
-        ),
-    };
-}
-
 fn log_io_error(header: &str, occurred_whilst: &str, io_error: &io::Error) {
     // We don't suggest opening a support ticket, since a subset of I/O errors can be caused
     // by issues in the application. In the future, perhaps we should try and split these out?
diff --git a/src/layers/python.rs b/src/layers/python.rs
index 8b75d66..8656628 100644
--- a/src/layers/python.rs
+++ b/src/layers/python.rs
@@ -321,6 +321,8 @@ fn generate_layer_env(layer_path: &Path, python_version: &PythonVersion) -> Laye
         // However, the uWSGI package uses the wrong `sysconfig` APIs so tries to reference the old
         // compile location, unless we override that by setting `PYTHONHOME`:
         // https://github.com/unbit/uwsgi/issues/2525
+        // In addition, some legacy apps have `PYTHONHOME` set to an invalid value, so if we did not
+        // set it explicitly here, Python would fail to run both during the build and at runtime.
         .chainable_insert(
             Scope::All,
             ModificationBehavior::Override,
diff --git a/src/main.rs b/src/main.rs
index 6a2b637..6de0acf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,10 +9,8 @@ mod errors;
 mod layers;
 mod package_manager;
 mod packaging_tool_versions;
-mod project_descriptor;
 mod python_version;
 mod runtime_txt;
-mod salesforce_functions;
 mod utils;
 
 use crate::layers::pip_cache::PipCacheLayer;
@@ -20,9 +18,7 @@ use crate::layers::pip_dependencies::{PipDependenciesLayer, PipDependenciesLayer
 use crate::layers::python::{PythonLayer, PythonLayerError};
 use crate::package_manager::{DeterminePackageManagerError, PackageManager};
 use crate::packaging_tool_versions::PackagingToolVersions;
-use crate::project_descriptor::ProjectDescriptorError;
 use crate::python_version::PythonVersionError;
-use crate::salesforce_functions::CheckSalesforceFunctionError;
 use libcnb::build::{BuildContext, BuildResult, BuildResultBuilder};
 use libcnb::data::layer_name;
 use libcnb::detect::{DetectContext, DetectResult, DetectResultBuilder};
@@ -55,8 +51,6 @@ impl Buildpack for PythonBuildpack {
     fn build(&self, context: BuildContext<Self>) -> libcnb::Result<BuildResult, Self::Error> {
         // We perform all project analysis up front, so the build can fail early if the config is invalid.
         // TODO: Add a "Build config" header and list all config in one place?
-        let is_function = salesforce_functions::is_function_project(&context.app_dir)
-            .map_err(BuildpackError::ProjectDescriptor)?;
         let package_manager = package_manager::determine_package_manager(&context.app_dir)
             .map_err(BuildpackError::DeterminePackageManager)?;
 
@@ -66,10 +60,10 @@ impl Buildpack for PythonBuildpack {
         let packaging_tool_versions = PackagingToolVersions::default();
 
         // We inherit the current process's env vars, since we want `PATH` and `HOME` from the OS
-        // to be set, so that later commands can find tools like Git in the stack image. We exclude
-        // user-provided env vars (by setting `clear-env` to true in `buildpack.toml`) to prevent an
-        // app's env vars from breaking internal buildpack commands. Any buildpack steps that need
-        // user-provided env vars must explicitly retrieve them via `context.platform.env`.
+        // to be set (so that later commands can find tools like Git in the stack image), along
+        // with previous-buildpack or user-provided env vars (so that features like env vars in
+        // in requirements files work). We protect against broken user-provided env vars by
+        // making sure that buildpack env vars take precedence in layers envs and command usage.
         let mut command_env = Env::from_current();
 
         // Create the layer containing the Python runtime, and the packages `pip`, `setuptools` and `wheel`.
@@ -86,7 +80,7 @@ impl Buildpack for PythonBuildpack {
 
         // Create the layers for the application dependencies and package manager cache.
         // In the future support will be added for package managers other than pip.
-        let dependencies_layer_env = match package_manager {
+        match package_manager {
             PackageManager::Pip => {
                 log_header("Installing dependencies using Pip");
                 let pip_cache_layer = context.handle_layer(
@@ -106,20 +100,8 @@ impl Buildpack for PythonBuildpack {
                 pip_layer.env
             }
         };
-        command_env = dependencies_layer_env.apply(Scope::Build, &command_env);
 
-        if is_function {
-            log_header("Validating Salesforce Function");
-            salesforce_functions::check_function(&command_env)
-                .map_err(BuildpackError::CheckSalesforceFunction)?;
-            log_info("Function passed validation.");
-
-            BuildResultBuilder::new()
-                .launch(salesforce_functions::launch_config())
-                .build()
-        } else {
-            BuildResultBuilder::new().build()
-        }
+        BuildResultBuilder::new().build()
     }
 
     fn on_error(&self, error: libcnb::Error<Self::Error>) {
@@ -129,16 +111,12 @@ impl Buildpack for PythonBuildpack {
 
 #[derive(Debug)]
 pub(crate) enum BuildpackError {
-    /// Errors running the `sf-functions-python check` command.
-    CheckSalesforceFunction(CheckSalesforceFunctionError),
     /// IO errors when performing buildpack detection.
     DetectIo(io::Error),
     /// Errors determining which Python package manager to use for a project.
     DeterminePackageManager(DeterminePackageManagerError),
     /// Errors installing the project's dependencies into a layer using Pip.
     PipDependenciesLayer(PipDependenciesLayerError),
-    /// Errors reading and parsing a `project.toml` file.
-    ProjectDescriptor(ProjectDescriptorError),
     /// Errors installing Python and required packaging tools into a layer.
     PythonLayer(PythonLayerError),
     /// Errors determining which Python version to use for a project.
diff --git a/src/project_descriptor.rs b/src/project_descriptor.rs
deleted file mode 100644
index f5d3f1e..0000000
--- a/src/project_descriptor.rs
+++ /dev/null
@@ -1,279 +0,0 @@
-use crate::utils;
-use serde::Deserialize;
-use std::io;
-use std::path::Path;
-
-/// Reads the `com.salesforce.type` field from any `project.toml` in the specified directory.
-///
-/// It is permitted for the `project.toml` file not to exist, or for there to be no `com.salesforce`
-/// table within the TOML document, in which case `Ok(None)` will be returned.
-///
-/// However, an error will be returned if any other IO error occurred, the file is not valid TOML,
-/// or the TOML document does not adhere to the schema.
-pub(crate) fn read_salesforce_project_type(
-    app_dir: &Path,
-) -> Result<Option<SalesforceProjectType>, ProjectDescriptorError> {
-    read_project_descriptor(app_dir).map(|descriptor| {
-        descriptor
-            .unwrap_or_default()
-            .com
-            .unwrap_or_default()
-            .salesforce
-            .map(|salesforce| salesforce.project_type)
-    })
-}
-
-/// Reads any `project.toml` file in the specified directory, parsing it into a [`ProjectDescriptor`].
-///
-/// It is permitted for the `project.toml` file not to exist, in which case `Ok(None)` will be returned.
-///
-/// However, an error will be returned if any other IO error occurred, the file is not valid TOML,
-/// or the TOML document does not adhere to the schema.
-fn read_project_descriptor(
-    app_dir: &Path,
-) -> Result<Option<ProjectDescriptor>, ProjectDescriptorError> {
-    let project_descriptor_path = app_dir.join("project.toml");
-
-    utils::read_optional_file(&project_descriptor_path)
-        .map_err(ProjectDescriptorError::Io)?
-        .map(|contents| parse(&contents).map_err(ProjectDescriptorError::Parse))
-        .transpose()
-}
-
-/// Parse the contents of a project descriptor TOML file into a [`ProjectDescriptor`].
-///
-/// An error will be returned if the string is not valid TOML, or the TOML document does not
-/// adhere to the schema.
-fn parse(contents: &str) -> Result<ProjectDescriptor, toml::de::Error> {
-    toml::from_str::<ProjectDescriptor>(contents)
-}
-
-/// Represents a Cloud Native Buildpack project descriptor file (`project.toml`).
-///
-/// Currently only fields used by the buildpack are enforced, so this represents only a
-/// subset of the upstream CNB project descriptor schema.
-///
-/// See: <https://github.com/buildpacks/spec/blob/main/extensions/project-descriptor.md>
-#[derive(Debug, Default, Deserialize, PartialEq)]
-struct ProjectDescriptor {
-    com: Option<ComTable>,
-}
-
-/// Represents the `com` table in the project descriptor.
-#[derive(Debug, Default, Deserialize, PartialEq)]
-struct ComTable {
-    salesforce: Option<SalesforceTable>,
-}
-
-/// Represents the `com.salesforce` table in the project descriptor.
-///
-/// Currently only fields used by the buildpack are enforced, so this represents only a
-/// subset of the Salesforce-specific project descriptor schema.
-///
-/// See: <https://salesforce.quip.com/tLL9AiScqg5q#WGeACA6OzZf>
-#[derive(Debug, Deserialize, PartialEq)]
-struct SalesforceTable {
-    #[serde(rename = "type")]
-    project_type: SalesforceProjectType,
-}
-
-/// The type of a Salesforce project.
-///
-/// For now `Function` is the only valid type, however others will be added in the future.
-///
-/// Unknown project types are intentionally rejected, since we're prioritising the UX for
-/// functions projects where the type may have been mis-spelt, over forward-compatibility.
-#[derive(Debug, Deserialize, PartialEq)]
-pub(crate) enum SalesforceProjectType {
-    #[serde(rename = "function")]
-    Function,
-}
-
-/// Errors that can occur when reading and parsing a `project.toml` file.
-#[derive(Debug)]
-pub(crate) enum ProjectDescriptorError {
-    Io(io::Error),
-    Parse(toml::de::Error),
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use libcnb_test::assert_contains;
-
-    #[test]
-    fn deserialize_empty_descriptor() {
-        assert_eq!(parse("").unwrap(), ProjectDescriptor { com: None });
-    }
-
-    #[test]
-    fn deserialize_non_salesforce_descriptor() {
-        let toml_str = r#"
-            [_]
-            schema-version = "0.2"
-
-            [io.buildpacks]
-            builder = "my-builder"
-
-            [com.example]
-            key = "value"
-        "#;
-
-        assert_eq!(
-            parse(toml_str),
-            Ok(ProjectDescriptor {
-                com: Some(ComTable { salesforce: None })
-            })
-        );
-    }
-
-    #[test]
-    fn deserialize_function_descriptor() {
-        let toml_str = r#"
-            [_]
-            schema-version = "0.2"
-
-            [com.salesforce]
-            schema-version = "0.1"
-            id = "example"
-            description = "Example function"
-            type = "function"
-            salesforce-api-version = "56.0"
-        "#;
-
-        assert_eq!(
-            parse(toml_str),
-            Ok(ProjectDescriptor {
-                com: Some(ComTable {
-                    salesforce: Some(SalesforceTable {
-                        project_type: SalesforceProjectType::Function
-                    })
-                })
-            })
-        );
-    }
-
-    #[test]
-    fn deserialize_minimal_function_descriptor() {
-        let toml_str = r#"
-            [com.salesforce]
-            type = "function"
-        "#;
-
-        assert_eq!(
-            parse(toml_str),
-            Ok(ProjectDescriptor {
-                com: Some(ComTable {
-                    salesforce: Some(SalesforceTable {
-                        project_type: SalesforceProjectType::Function
-                    })
-                })
-            })
-        );
-    }
-
-    #[test]
-    fn reject_salesforce_table_with_no_project_type() {
-        let toml_str = r#"
-            [com.salesforce]
-            schema-version = "0.1"
-            id = "example"
-        "#;
-
-        let error = parse(toml_str).unwrap_err();
-        assert_contains!(error.to_string(), "missing field `type`");
-    }
-
-    #[test]
-    fn reject_unknown_salesforce_project_type() {
-        let toml_str = r#"
-            [com.salesforce]
-            type = "some_unknown_type"
-        "#;
-
-        let error = parse(toml_str).unwrap_err();
-        assert_contains!(
-            error.to_string(),
-            "unknown variant `some_unknown_type`, expected `function`"
-        );
-    }
-
-    #[test]
-    fn read_project_descriptor_no_project_toml_file() {
-        let app_dir = Path::new("tests/fixtures/empty");
-
-        assert_eq!(read_project_descriptor(app_dir).unwrap(), None);
-    }
-
-    #[test]
-    fn read_project_descriptor_non_salesforce() {
-        let app_dir = Path::new("tests/fixtures/project_toml_non_salesforce");
-
-        assert_eq!(
-            read_project_descriptor(app_dir).unwrap(),
-            Some(ProjectDescriptor {
-                com: Some(ComTable { salesforce: None })
-            })
-        );
-    }
-
-    #[test]
-    fn read_project_descriptor_function() {
-        let app_dir = Path::new("tests/fixtures/salesforce_function_template");
-
-        assert_eq!(
-            read_project_descriptor(app_dir).unwrap(),
-            Some(ProjectDescriptor {
-                com: Some(ComTable {
-                    salesforce: Some(SalesforceTable {
-                        project_type: SalesforceProjectType::Function
-                    })
-                })
-            })
-        );
-    }
-
-    #[test]
-    fn read_project_descriptor_invalid_project_toml_file() {
-        let app_dir = Path::new("tests/fixtures/project_toml_invalid");
-
-        assert!(matches!(
-            read_project_descriptor(app_dir).unwrap_err(),
-            ProjectDescriptorError::Parse(_)
-        ));
-    }
-
-    #[test]
-    fn get_salesforce_project_type_missing() {
-        let app_dir = Path::new("tests/fixtures/empty");
-
-        assert_eq!(read_salesforce_project_type(app_dir).unwrap(), None);
-    }
-
-    #[test]
-    fn get_salesforce_project_type_non_salesforce() {
-        let app_dir = Path::new("tests/fixtures/project_toml_non_salesforce");
-
-        assert_eq!(read_salesforce_project_type(app_dir).unwrap(), None);
-    }
-
-    #[test]
-    fn get_salesforce_project_type_function() {
-        let app_dir = Path::new("tests/fixtures/salesforce_function_template");
-
-        assert_eq!(
-            read_salesforce_project_type(app_dir).unwrap(),
-            Some(SalesforceProjectType::Function)
-        );
-    }
-
-    #[test]
-    fn get_salesforce_project_type_invalid_project_toml_file() {
-        let app_dir = Path::new("tests/fixtures/project_toml_invalid");
-
-        assert!(matches!(
-            read_salesforce_project_type(app_dir).unwrap_err(),
-            ProjectDescriptorError::Parse(_)
-        ));
-    }
-}
diff --git a/src/salesforce_functions.rs b/src/salesforce_functions.rs
deleted file mode 100644
index 90b7476..0000000
--- a/src/salesforce_functions.rs
+++ /dev/null
@@ -1,119 +0,0 @@
-use crate::project_descriptor::{self, ProjectDescriptorError, SalesforceProjectType};
-use libcnb::data::launch::{Launch, LaunchBuilder, ProcessBuilder};
-use libcnb::data::process_type;
-use libcnb::Env;
-use std::io;
-use std::path::Path;
-use std::process::{Command, Output};
-
-/// The program/script name of the Python Functions runtime's CLI.
-pub(crate) const FUNCTION_RUNTIME_PROGRAM_NAME: &str = "sf-functions-python";
-
-/// Detect whether the specified project directory is that of a Salesforce Function.
-///
-/// Returns `Ok(true)` if the specified project directory contains a `project.toml` file with a
-/// `com.salesforce.type` of "function".
-///
-/// It is permitted for the `project.toml` file not to exist, or for there to be no `com.salesforce`
-/// TOML table within the file, in which case `Ok(false)` will be returned.
-///
-/// However, an error will be returned if any other IO error occurred, if the `project.toml` file
-/// is not valid TOML, or the TOML document does not adhere to the schema.
-pub(crate) fn is_function_project(app_dir: &Path) -> Result<bool, ProjectDescriptorError> {
-    project_descriptor::read_salesforce_project_type(app_dir)
-        .map(|project_type| project_type == Some(SalesforceProjectType::Function))
-}
-
-/// Validate the function using the `sf-functions-python check` command.
-pub(crate) fn check_function(command_env: &Env) -> Result<(), CheckSalesforceFunctionError> {
-    // Not using `utils::run_command` since we want to capture output and only
-    // display it if the check command fails.
-    Command::new(FUNCTION_RUNTIME_PROGRAM_NAME)
-        .args(["check", "."])
-        .env_clear()
-        .envs(command_env)
-        .output()
-        .map_err(|io_error| match io_error.kind() {
-            io::ErrorKind::NotFound => CheckSalesforceFunctionError::ProgramNotFound,
-            _ => CheckSalesforceFunctionError::Io(io_error),
-        })
-        .and_then(|output| {
-            if output.status.success() {
-                Ok(())
-            } else {
-                Err(CheckSalesforceFunctionError::NonZeroExitStatus(output))
-            }
-        })
-}
-
-/// Generate a `launch.toml` configuration for running Python Salesforce Functions.
-///
-/// Runs the `sf-functions-python serve` command with suitable options for production.
-pub(crate) fn launch_config() -> Launch {
-    LaunchBuilder::new()
-        .process(
-            // TODO: Stop running via bash once the launcher supports env var interpolation:
-            // https://github.com/buildpacks/rfcs/issues/258
-            ProcessBuilder::new(process_type!("web"), ["bash"])
-                .args([
-                    "-c",
-                    &[
-                        "exec",
-                        FUNCTION_RUNTIME_PROGRAM_NAME,
-                        "serve",
-                        "--host",
-                        "0.0.0.0",
-                        "--port",
-                        "\"${PORT:-8080}\"",
-                        // TODO: Determine optimal number of workers.
-                        "--workers",
-                        "4",
-                        ".",
-                    ]
-                    .join(" "),
-                ])
-                .default(true)
-                .build(),
-        )
-        .build()
-}
-
-/// Errors that can occur when running the `sf-functions-python check` command.
-#[derive(Debug)]
-pub(crate) enum CheckSalesforceFunctionError {
-    Io(io::Error),
-    NonZeroExitStatus(Output),
-    ProgramNotFound,
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn is_function_project_no_project_toml() {
-        assert!(!is_function_project(Path::new("tests/fixtures/empty")).unwrap());
-    }
-
-    #[test]
-    fn is_function_project_non_salesforce_project_toml() {
-        assert!(
-            !is_function_project(Path::new("tests/fixtures/project_toml_non_salesforce")).unwrap()
-        );
-    }
-
-    #[test]
-    fn is_function_project_valid_function_project_toml() {
-        assert!(
-            is_function_project(Path::new("tests/fixtures/salesforce_function_template")).unwrap()
-        );
-    }
-
-    #[test]
-    fn is_function_project_invalid_project_toml() {
-        assert!(matches!(
-            is_function_project(Path::new("tests/fixtures/project_toml_invalid")).unwrap_err(),
-            ProjectDescriptorError::Parse(_)
-        ));
-    }
-}
diff --git a/tests/fixtures/pip_basic/requirements.txt b/tests/fixtures/pip_basic/requirements.txt
index fd0f81c..21e4839 100644
--- a/tests/fixtures/pip_basic/requirements.txt
+++ b/tests/fixtures/pip_basic/requirements.txt
@@ -1,2 +1,2 @@
 # This package has been picked since it has no dependencies and is small/fast to install.
-typing-extensions==4.4.0
+typing-extensions==4.7.1
diff --git a/tests/fixtures/pip_editable_git_compiled/requirements.txt b/tests/fixtures/pip_editable_git_compiled/requirements.txt
index a6710b5..a9b27b0 100644
--- a/tests/fixtures/pip_editable_git_compiled/requirements.txt
+++ b/tests/fixtures/pip_editable_git_compiled/requirements.txt
@@ -4,5 +4,8 @@
 #
 # A C-based package is used instead of a pure Python package, in order to test that the
 # Python headers can be found in the `include/pythonX.Y/` directory of the Python layer.
+#
+# The URL to the package is specified via env var, to test that user-provided env vars
+# are propagated to pip for use by its env var interpolation feature.
 
--e git+https://github.com/pypa/wheel@0.40.0#egg=extension.dist&subdirectory=tests/testdata/extension.dist
+-e git+${WHEEL_PACKAGE_URL}@0.40.0#egg=extension.dist&subdirectory=tests/testdata/extension.dist
diff --git a/tests/fixtures/project_toml_invalid/project.toml b/tests/fixtures/project_toml_invalid/project.toml
deleted file mode 100644
index 7a6399a..0000000
--- a/tests/fixtures/project_toml_invalid/project.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[_]
-schema-version = "0.2"
-
-[com.salesforce]
-# The required fields here are missing.
diff --git a/tests/fixtures/project_toml_invalid/requirements.txt b/tests/fixtures/project_toml_invalid/requirements.txt
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/fixtures/project_toml_non_salesforce/project.toml b/tests/fixtures/project_toml_non_salesforce/project.toml
deleted file mode 100644
index dd8b5ef..0000000
--- a/tests/fixtures/project_toml_non_salesforce/project.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[_]
-schema-version = "0.2"
-
-[io.buildpacks]
-builder = "my-builder"
-
-[com.example]
-key = "value"
diff --git a/tests/fixtures/salesforce_function_fails_self_check/main.py b/tests/fixtures/salesforce_function_fails_self_check/main.py
deleted file mode 100644
index b46ee45..0000000
--- a/tests/fixtures/salesforce_function_fails_self_check/main.py
+++ /dev/null
@@ -1,5 +0,0 @@
-from salesforce_functions import Context, InvocationEvent
-
-
-def function(_event: InvocationEvent[None], _context: Context) -> None:
-    return None
diff --git a/tests/fixtures/salesforce_function_fails_self_check/project.toml b/tests/fixtures/salesforce_function_fails_self_check/project.toml
deleted file mode 100644
index 2a44a3a..0000000
--- a/tests/fixtures/salesforce_function_fails_self_check/project.toml
+++ /dev/null
@@ -1,3 +0,0 @@
-[com.salesforce]
-type = "function"
-salesforce-api-version = "invalid"
diff --git a/tests/fixtures/salesforce_function_fails_self_check/requirements.txt b/tests/fixtures/salesforce_function_fails_self_check/requirements.txt
deleted file mode 100644
index ced5be3..0000000
--- a/tests/fixtures/salesforce_function_fails_self_check/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-salesforce-functions
diff --git a/tests/fixtures/salesforce_function_missing_package/main.py b/tests/fixtures/salesforce_function_missing_package/main.py
deleted file mode 100644
index 80920de..0000000
--- a/tests/fixtures/salesforce_function_missing_package/main.py
+++ /dev/null
@@ -1,5 +0,0 @@
-from salesforce_functions import Context, InvocationEvent
-
-
-async def function(_event: InvocationEvent[None], _context: Context) -> None:
-    return None
diff --git a/tests/fixtures/salesforce_function_missing_package/project.toml b/tests/fixtures/salesforce_function_missing_package/project.toml
deleted file mode 100644
index ef6d5f8..0000000
--- a/tests/fixtures/salesforce_function_missing_package/project.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-[com.salesforce]
-type = "function"
diff --git a/tests/fixtures/salesforce_function_missing_package/requirements.txt b/tests/fixtures/salesforce_function_missing_package/requirements.txt
deleted file mode 100644
index fbb9d22..0000000
--- a/tests/fixtures/salesforce_function_missing_package/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-# The salesforce-functions package is missing from here.
diff --git a/tests/fixtures/salesforce_function_template/README.md b/tests/fixtures/salesforce_function_template/README.md
deleted file mode 100644
index 4bcafa9..0000000
--- a/tests/fixtures/salesforce_function_template/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Pythonexample Function
-
-<Describe the function here>
diff --git a/tests/fixtures/salesforce_function_template/main.py b/tests/fixtures/salesforce_function_template/main.py
deleted file mode 100644
index 4c05d20..0000000
--- a/tests/fixtures/salesforce_function_template/main.py
+++ /dev/null
@@ -1,20 +0,0 @@
-from typing import Any
-
-from salesforce_functions import Context, InvocationEvent, get_logger
-
-# The type of the data payload sent with the invocation event.
-# Change this to a more specific type matching the expected payload for
-# improved IDE auto-completion and linting coverage. For example:
-# `EventPayloadType = dict[str, Any]`
-EventPayloadType = Any
-
-logger = get_logger()
-
-
-async def function(event: InvocationEvent[EventPayloadType], context: Context):
-    """Describe the function here."""
-
-    result = await context.org.data_api.query("SELECT Id, Name FROM Account")
-    logger.info(f"Function successfully queried {result.total_size} account records!")
-
-    return result.records
diff --git a/tests/fixtures/salesforce_function_template/payload.json b/tests/fixtures/salesforce_function_template/payload.json
deleted file mode 100644
index 0967ef4..0000000
--- a/tests/fixtures/salesforce_function_template/payload.json
+++ /dev/null
@@ -1 +0,0 @@
-{}
diff --git a/tests/fixtures/salesforce_function_template/project.toml b/tests/fixtures/salesforce_function_template/project.toml
deleted file mode 100644
index ac505f2..0000000
--- a/tests/fixtures/salesforce_function_template/project.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[_]
-schema-version = "0.2"
-
-[com.salesforce]
-schema-version = "0.1"
-id = "pythonexample"
-description = "A Salesforce Function"
-type = "function"
-salesforce-api-version = "56.0"
diff --git a/tests/fixtures/salesforce_function_template/requirements.txt b/tests/fixtures/salesforce_function_template/requirements.txt
deleted file mode 100644
index ced5be3..0000000
--- a/tests/fixtures/salesforce_function_template/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-salesforce-functions
diff --git a/tests/integration/mod.rs b/tests/integration/mod.rs
index 0d295ef..97f548c 100644
--- a/tests/integration/mod.rs
+++ b/tests/integration/mod.rs
@@ -7,7 +7,6 @@ mod detect;
 mod package_manager;
 mod pip;
 mod python_version;
-mod salesforce_functions;
 
 const LATEST_PYTHON_3_7: &str = "3.7.17";
 const LATEST_PYTHON_3_8: &str = "3.8.17";
diff --git a/tests/integration/pip.rs b/tests/integration/pip.rs
index 061c025..0a14caf 100644
--- a/tests/integration/pip.rs
+++ b/tests/integration/pip.rs
@@ -33,10 +33,12 @@ fn pip_basic_install_and_cache_reuse() {
                 
                 [Installing dependencies using Pip]
                 Running pip install
-                Collecting typing-extensions==4.4.0 (from -r requirements.txt (line 2))
-                  Downloading typing_extensions-4.4.0-py3-none-any.whl (26 kB)
+                Collecting typing-extensions==4.7.1 (from -r requirements.txt (line 2))
+                  Obtaining dependency information for typing-extensions==4.7.1 from https://files.pythonhosted.org/packages/ec/6b/63cc3df74987c36fe26157ee12e09e8f9db4de771e0f3404263117e75b95/typing_extensions-4.7.1-py3-none-any.whl.metadata
+                  Downloading typing_extensions-4.7.1-py3-none-any.whl.metadata (3.1 kB)
+                Downloading typing_extensions-4.7.1-py3-none-any.whl (33 kB)
                 Installing collected packages: typing-extensions
-                Successfully installed typing-extensions-4.4.0
+                Successfully installed typing-extensions-4.7.1
                 ===> EXPORTING
             "}
         );
@@ -59,7 +61,7 @@ fn pip_basic_install_and_cache_reuse() {
                 ----------------- -------
                 pip               {pip_version}
                 setuptools        {setuptools_version}
-                typing_extensions 4.4.0
+                typing_extensions 4.7.1
                 wheel             {wheel_version}
                 Defaulting to user installation because normal site-packages is not writeable
                 Requirement already satisfied: typing-extensions in /layers/heroku_python/dependencies/lib/"
@@ -84,10 +86,12 @@ fn pip_basic_install_and_cache_reuse() {
                     [Installing dependencies using Pip]
                     Using cached pip download/wheel cache
                     Running pip install
-                    Collecting typing-extensions==4.4.0 (from -r requirements.txt (line 2))
-                      Using cached typing_extensions-4.4.0-py3-none-any.whl (26 kB)
+                    Collecting typing-extensions==4.7.1 (from -r requirements.txt (line 2))
+                      Obtaining dependency information for typing-extensions==4.7.1 from https://files.pythonhosted.org/packages/ec/6b/63cc3df74987c36fe26157ee12e09e8f9db4de771e0f3404263117e75b95/typing_extensions-4.7.1-py3-none-any.whl.metadata
+                      Using cached typing_extensions-4.7.1-py3-none-any.whl.metadata (3.1 kB)
+                    Using cached typing_extensions-4.7.1-py3-none-any.whl (33 kB)
                     Installing collected packages: typing-extensions
-                    Successfully installed typing-extensions-4.4.0
+                    Successfully installed typing-extensions-4.7.1
                     ===> EXPORTING
                 "}
             );
@@ -137,10 +141,12 @@ fn pip_cache_invalidation_and_metadata_compatibility() {
                         [Installing dependencies using Pip]
                         Discarding cached pip download/wheel cache
                         Running pip install
-                        Collecting typing-extensions==4.4.0 (from -r requirements.txt (line 2))
-                          Downloading typing_extensions-4.4.0-py3-none-any.whl (26 kB)
+                        Collecting typing-extensions==4.7.1 (from -r requirements.txt (line 2))
+                          Obtaining dependency information for typing-extensions==4.7.1 from https://files.pythonhosted.org/packages/ec/6b/63cc3df74987c36fe26157ee12e09e8f9db4de771e0f3404263117e75b95/typing_extensions-4.7.1-py3-none-any.whl.metadata
+                          Downloading typing_extensions-4.7.1-py3-none-any.whl.metadata (3.1 kB)
+                        Downloading typing_extensions-4.7.1-py3-none-any.whl (33 kB)
                         Installing collected packages: typing-extensions
-                        Successfully installed typing-extensions-4.4.0
+                        Successfully installed typing-extensions-4.7.1
                         ===> EXPORTING
                     "}
                 );
@@ -150,6 +156,7 @@ fn pip_cache_invalidation_and_metadata_compatibility() {
 }
 
 // This tests that:
+//  - Requirements file env var interpolation works (ie: user-provided env vars have been propagated to pip).
 //  - Git from the stack image can be found (ie: the system PATH has been correctly propagated to pip).
 //  - The editable mode repository clone is saved into the dependencies layer not the app dir.
 //  - Compiling a source distribution package (as opposed to a pre-built wheel) works.
@@ -158,7 +165,8 @@ fn pip_cache_invalidation_and_metadata_compatibility() {
 #[ignore = "integration test"]
 fn pip_editable_git_compiled() {
     TestRunner::default().build(
-        BuildConfig::new(builder(), "tests/fixtures/pip_editable_git_compiled"),
+        BuildConfig::new(builder(), "tests/fixtures/pip_editable_git_compiled")
+            .env("WHEEL_PACKAGE_URL", "https://github.com/pypa/wheel"),
         |context| {
             assert_contains!(
                 context.pack_stdout,
diff --git a/tests/integration/python_version.rs b/tests/integration/python_version.rs
index dbc1e3e..cb872db 100644
--- a/tests/integration/python_version.rs
+++ b/tests/integration/python_version.rs
@@ -76,9 +76,17 @@ fn builds_with_python_version(fixture_path: &str, python_version: &str) {
     } = PackagingToolVersions::default();
 
     let mut config = BuildConfig::new(builder(), fixture_path);
-    // Checks that potentially broken user-provided env vars are not being passed unfiltered to
-    // subprocesses we launch (such as `pip install`), thanks to `clear-env` in `buildpack.toml`.
-    config.env("PYTHONHOME", "/invalid-path");
+    // Checks that potentially broken user-provided env vars don't take precedence over those
+    // set by this buildpack and break running Python. These are based on the env vars that
+    // used to be set by `bin/release` by very old versions of the classic Python buildpack:
+    // https://github.com/heroku/heroku-buildpack-python/blob/27abdfe7d7ad104dabceb45641415251e965671c/bin/release#L11-L18
+    config.envs([
+        ("LD_LIBRARY_PATH", "/invalid-path"),
+        ("LIBRARY_PATH", "/invalid-path"),
+        ("PATH", "/invalid-path"),
+        ("PYTHONHOME", "/invalid-path"),
+        ("PYTHONPATH", "/invalid-path"),
+    ]);
 
     TestRunner::default().build(config, |context| {
         assert_empty!(context.pack_stderr);
diff --git a/tests/integration/salesforce_functions.rs b/tests/integration/salesforce_functions.rs
deleted file mode 100644
index c6d4ed8..0000000
--- a/tests/integration/salesforce_functions.rs
+++ /dev/null
@@ -1,137 +0,0 @@
-use crate::integration_tests::builder;
-use indoc::indoc;
-use libcnb_test::{
-    assert_contains, assert_empty, BuildConfig, ContainerConfig, PackResult, TestRunner,
-};
-use std::thread;
-use std::time::Duration;
-
-const TEST_PORT: u16 = 12345;
-
-#[test]
-#[ignore = "integration test"]
-fn salesforce_function_template() {
-    TestRunner::default().build(
-        BuildConfig::new(builder(), "tests/fixtures/salesforce_function_template"),
-        |context| {
-            assert_empty!(context.pack_stderr);
-            assert_contains!(
-                context.pack_stdout,
-                indoc! {"
-                    [Validating Salesforce Function]
-                    Function passed validation.
-                    ===> EXPORTING
-                "}
-            );
-            assert_contains!(context.pack_stdout, "Setting default process type 'web'");
-
-            // Test that the `sf-functions-python` web process the buildpack configures works correctly.
-            context.start_container(
-                ContainerConfig::new()
-                    .env("PORT", TEST_PORT.to_string())
-                    .expose_port(TEST_PORT),
-                |container| {
-                    let address_on_host = container.address_for_port(TEST_PORT).unwrap();
-                    let url = format!("http://{}:{}", address_on_host.ip(), address_on_host.port());
-
-                    // Retries needed since the server takes a moment to start up.
-                    let mut attempts_remaining = 5;
-                    let response = loop {
-                        let response = ureq::post(&url).set("x-health-check", "true").call();
-                        if response.is_ok() || attempts_remaining == 0 {
-                            break response;
-                        }
-                        attempts_remaining -= 1;
-                        thread::sleep(Duration::from_secs(1));
-                    };
-
-                    let server_log_output = container.logs_now();
-                    assert_contains!(
-                        server_log_output.stderr,
-                        &format!("Uvicorn running on http://0.0.0.0:{TEST_PORT}")
-                    );
-
-                    let body = response.unwrap().into_string().unwrap();
-                    assert_eq!(body, r#""OK""#);
-                },
-            );
-        },
-    );
-}
-
-#[test]
-#[ignore = "integration test"]
-fn salesforce_function_missing_package() {
-    TestRunner::default().build(
-        BuildConfig::new(
-            builder(),
-            "tests/fixtures/salesforce_function_missing_package",
-        )
-        .expected_pack_result(PackResult::Failure),
-        |context| {
-            assert_contains!(
-                context.pack_stderr,
-                indoc! {r#"
-                    [Error: The Salesforce Functions package is not installed]
-                    The 'sf-functions-python' program that is required for Python Salesforce
-                    Functions could not be found.
-                    
-                    Check that the 'salesforce-functions' Python package is listed as a
-                    dependency in 'requirements.txt'.
-                    
-                    If this project is not intended to be a Salesforce Function, remove the
-                    'type = "function"' declaration from 'project.toml' to skip this check.
-                "#}
-            );
-        },
-    );
-}
-
-#[test]
-#[ignore = "integration test"]
-fn salesforce_function_fails_self_check() {
-    TestRunner::default().build(
-        BuildConfig::new(
-            builder(),
-            "tests/fixtures/salesforce_function_fails_self_check",
-        )
-        .expected_pack_result(PackResult::Failure),
-        |context| {
-            assert_contains!(
-                context.pack_stderr,
-                indoc! {"
-                    [Error: The Salesforce Functions self-check failed]
-                    The 'sf-functions-python check' command failed (exit status: 1), indicating
-                    there is a problem with the Python Salesforce Function in this project.
-                    
-                    Details:
-                    Function failed validation: 'invalid' isn't a valid Salesforce REST API version."
-                }
-            );
-        },
-    );
-}
-
-#[test]
-#[ignore = "integration test"]
-fn project_toml_invalid() {
-    TestRunner::default().build(
-        BuildConfig::new(builder(), "tests/fixtures/project_toml_invalid")
-            .expected_pack_result(PackResult::Failure),
-        |context| {
-            assert_contains!(
-                context.pack_stderr,
-                indoc! {r#"
-                    [Error: Invalid project.toml]
-                    A parsing/validation error error occurred whilst loading the project.toml file.
-                    
-                    Details: TOML parse error at line 4, column 1
-                      |
-                    4 | [com.salesforce]
-                      | ^^^^^^^^^^^^^^^^
-                    missing field `type`
-                "#}
-            );
-        },
-    );
-}