diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8176b37..53d2cd5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -58,7 +58,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [14.x, 16.x]
+        node: [18.x, 20.x, 21.x]
         deno: ['1']
     steps:
     - uses: actions/checkout@v2
diff --git a/src/generator.ts b/src/generator.ts
index 1a2e686..5d11221 100644
--- a/src/generator.ts
+++ b/src/generator.ts
@@ -537,22 +537,17 @@ export class Generator {
    * Link a module, installing all dependencies necessary into the map
    * to support its execution including static and dynamic module imports.
    *
-   * @param specifier Module to link
+   * @param specifier Module or list of modules to link
    * @param parentUrl Optional parent URL
    */
   async link(
-    specifier?: string | string[],
+    specifier: string | string[],
     parentUrl?: string
   ): Promise<{ staticDeps: string[]; dynamicDeps: string[] }> {
     if (typeof specifier === "string") specifier = [specifier];
     let error = false;
     if (this.installCnt++ === 0) this.traceMap.startInstall();
     await this.traceMap.processInputMap;
-    if (!specifier || specifier.length === 0) {
-      const { map, staticDeps, dynamicDeps } = await this.traceMap.finishInstall();
-      this.map = map;
-      return { staticDeps, dynamicDeps };
-    }
     specifier = specifier.map((specifier) => specifier.replace(/\\/g, "/"));
     try {
       await Promise.all(
@@ -1010,6 +1005,21 @@ export class Generator {
     }
   }
 
+  /**
+   * Locking install, retraces all top-level pins but does not change the
+   * versions of anything (similar to "npm ci").
+   */
+  async reinstall() {
+    if (this.installCnt++ === 0) this.traceMap.startInstall();
+    await this.traceMap.processInputMap;
+    if (--this.installCnt === 0) {
+      const { map, staticDeps, dynamicDeps } =
+        await this.traceMap.finishInstall();
+      this.map = map;
+      return { staticDeps, dynamicDeps };
+    }
+  }
+
   /**
    * Updates the versions of the given packages to the latest versions
    * compatible with their parent's package.json ranges. If no packages are
diff --git a/test/api/providerswitch.test.js b/test/api/providerswitch.test.js
index 2667294..e0e6003 100644
--- a/test/api/providerswitch.test.js
+++ b/test/api/providerswitch.test.js
@@ -13,7 +13,7 @@ const generator = new Generator({
 
 // The generator should swap the provider from skypack to jspm.io.
 // TODO: once we land defaultProvider changes this test will break
-await generator.install();
+await generator.reinstall();
 
 const json = generator.getMap();
 assert(json.imports.react.startsWith("https://ga.jspm.io/npm:"));
diff --git a/test/api/reenv.test.js b/test/api/reenv.test.js
index 852ebe7..1b4b9b4 100644
--- a/test/api/reenv.test.js
+++ b/test/api/reenv.test.js
@@ -19,7 +19,7 @@ import assert from "assert";
     env: ["production", "browser"],
   });
 
-  await generator.link();
+  await generator.reinstall();
   const json = generator.getMap();
 
   assert.strictEqual(
@@ -50,7 +50,7 @@ import assert from "assert";
     },
   });
 
-  await generator.link();
+  await generator.reinstall();
 
   const json = generator.getMap();
 
diff --git a/test/providers/esmsh.test.js b/test/providers/esmsh.test.skip.js
similarity index 100%
rename from test/providers/esmsh.test.js
rename to test/providers/esmsh.test.skip.js
diff --git a/test/test.html b/test/test.html
index f3bde45..f393db0 100644
--- a/test/test.html
+++ b/test/test.html
@@ -10,7 +10,7 @@
   "scopes": {
     "../": {
       "#fetch": "../dist/fetch-native.js",
-      "@babel/core": "https://ga.jspm.io/npm:@babel/core@7.23.3/lib/index.js",
+      "@babel/core": "https://ga.jspm.io/npm:@babel/core@7.23.5/lib/index.js",
       "@babel/plugin-syntax-import-assertions": "https://ga.jspm.io/npm:@babel/plugin-syntax-import-assertions@7.23.3/lib/index.js",
       "@babel/preset-typescript": "https://ga.jspm.io/npm:@babel/preset-typescript@7.23.3/lib/index.js",
       "@jspm/import-map": "https://ga.jspm.io/npm:@jspm/import-map@1.0.7/dist/map.js",
@@ -23,19 +23,19 @@
       "url": "https://ga.jspm.io/npm:@jspm/core@2.0.1/nodelibs/browser/url.js"
     },
     "https://ga.jspm.io/": {
-      "#lib/config/files/index.js": "https://ga.jspm.io/npm:@babel/core@7.23.3/lib/config/files/index-browser.js",
-      "#lib/config/resolve-targets.js": "https://ga.jspm.io/npm:@babel/core@7.23.3/lib/config/resolve-targets-browser.js",
-      "#lib/transform-file.js": "https://ga.jspm.io/npm:@babel/core@7.23.3/lib/transform-file-browser.js",
-      "#node.js": "https://ga.jspm.io/npm:browserslist@4.22.1/browser.js",
+      "#lib/config/files/index.js": "https://ga.jspm.io/npm:@babel/core@7.23.5/lib/config/files/index-browser.js",
+      "#lib/config/resolve-targets.js": "https://ga.jspm.io/npm:@babel/core@7.23.5/lib/config/resolve-targets-browser.js",
+      "#lib/transform-file.js": "https://ga.jspm.io/npm:@babel/core@7.23.5/lib/transform-file-browser.js",
+      "#node.js": "https://ga.jspm.io/npm:browserslist@4.22.2/browser.js",
       "@ampproject/remapping": "https://ga.jspm.io/npm:@ampproject/remapping@2.2.1/dist/remapping.umd.js",
-      "@babel/code-frame": "https://ga.jspm.io/npm:@babel/code-frame@7.22.13/lib/index.js",
-      "@babel/compat-data/native-modules": "https://ga.jspm.io/npm:@babel/compat-data@7.23.3/native-modules.js",
-      "@babel/compat-data/plugins": "https://ga.jspm.io/npm:@babel/compat-data@7.23.3/plugins.js",
-      "@babel/core": "https://ga.jspm.io/npm:@babel/core@7.23.3/lib/index.js",
-      "@babel/generator": "https://ga.jspm.io/npm:@babel/generator@7.23.3/lib/index.js",
+      "@babel/code-frame": "https://ga.jspm.io/npm:@babel/code-frame@7.23.5/lib/index.js",
+      "@babel/compat-data/native-modules": "https://ga.jspm.io/npm:@babel/compat-data@7.23.5/native-modules.js",
+      "@babel/compat-data/plugins": "https://ga.jspm.io/npm:@babel/compat-data@7.23.5/plugins.js",
+      "@babel/core": "https://ga.jspm.io/npm:@babel/core@7.23.5/lib/index.js",
+      "@babel/generator": "https://ga.jspm.io/npm:@babel/generator@7.23.5/lib/index.js",
       "@babel/helper-annotate-as-pure": "https://ga.jspm.io/npm:@babel/helper-annotate-as-pure@7.22.5/lib/index.js",
       "@babel/helper-compilation-targets": "https://ga.jspm.io/npm:@babel/helper-compilation-targets@7.22.15/lib/index.js",
-      "@babel/helper-create-class-features-plugin": "https://ga.jspm.io/npm:@babel/helper-create-class-features-plugin@7.22.15/lib/index.js",
+      "@babel/helper-create-class-features-plugin": "https://ga.jspm.io/npm:@babel/helper-create-class-features-plugin@7.23.5/lib/index.js",
       "@babel/helper-environment-visitor": "https://ga.jspm.io/npm:@babel/helper-environment-visitor@7.22.20/lib/index.js",
       "@babel/helper-function-name": "https://ga.jspm.io/npm:@babel/helper-function-name@7.23.0/lib/index.js",
       "@babel/helper-hoist-variables": "https://ga.jspm.io/npm:@babel/helper-hoist-variables@7.22.5/lib/index.js",
@@ -48,34 +48,34 @@
       "@babel/helper-simple-access": "https://ga.jspm.io/npm:@babel/helper-simple-access@7.22.5/lib/index.js",
       "@babel/helper-skip-transparent-expression-wrappers": "https://ga.jspm.io/npm:@babel/helper-skip-transparent-expression-wrappers@7.22.5/lib/index.js",
       "@babel/helper-split-export-declaration": "https://ga.jspm.io/npm:@babel/helper-split-export-declaration@7.22.6/lib/index.js",
-      "@babel/helper-string-parser": "https://ga.jspm.io/npm:@babel/helper-string-parser@7.22.5/lib/index.js",
+      "@babel/helper-string-parser": "https://ga.jspm.io/npm:@babel/helper-string-parser@7.23.4/lib/index.js",
       "@babel/helper-validator-identifier": "https://ga.jspm.io/npm:@babel/helper-validator-identifier@7.22.20/lib/index.js",
-      "@babel/helper-validator-option": "https://ga.jspm.io/npm:@babel/helper-validator-option@7.22.15/lib/index.js",
-      "@babel/helpers": "https://ga.jspm.io/npm:@babel/helpers@7.23.2/lib/index.js",
-      "@babel/highlight": "https://ga.jspm.io/npm:@babel/highlight@7.22.20/lib/index.js",
-      "@babel/parser": "https://ga.jspm.io/npm:@babel/parser@7.23.3/lib/index.js",
+      "@babel/helper-validator-option": "https://ga.jspm.io/npm:@babel/helper-validator-option@7.23.5/lib/index.js",
+      "@babel/helpers": "https://ga.jspm.io/npm:@babel/helpers@7.23.5/lib/index.js",
+      "@babel/highlight": "https://ga.jspm.io/npm:@babel/highlight@7.23.4/lib/index.js",
+      "@babel/parser": "https://ga.jspm.io/npm:@babel/parser@7.23.5/lib/index.js",
       "@babel/plugin-syntax-jsx": "https://ga.jspm.io/npm:@babel/plugin-syntax-jsx@7.23.3/lib/index.js",
       "@babel/plugin-syntax-typescript": "https://ga.jspm.io/npm:@babel/plugin-syntax-typescript@7.23.3/lib/index.js",
       "@babel/plugin-transform-modules-commonjs": "https://ga.jspm.io/npm:@babel/plugin-transform-modules-commonjs@7.23.3/lib/index.js",
-      "@babel/plugin-transform-typescript": "https://ga.jspm.io/npm:@babel/plugin-transform-typescript@7.23.3/lib/index.js",
+      "@babel/plugin-transform-typescript": "https://ga.jspm.io/npm:@babel/plugin-transform-typescript@7.23.5/lib/index.js",
       "@babel/template": "https://ga.jspm.io/npm:@babel/template@7.22.15/lib/index.js",
-      "@babel/traverse": "https://ga.jspm.io/npm:@babel/traverse@7.23.3/lib/index.js",
-      "@babel/types": "https://ga.jspm.io/npm:@babel/types@7.23.3/lib/index.js",
+      "@babel/traverse": "https://ga.jspm.io/npm:@babel/traverse@7.23.5/lib/index.js",
+      "@babel/types": "https://ga.jspm.io/npm:@babel/types@7.23.5/lib/index.js",
       "@jridgewell/gen-mapping": "https://ga.jspm.io/npm:@jridgewell/gen-mapping@0.3.3/dist/gen-mapping.umd.js",
       "@jridgewell/resolve-uri": "https://ga.jspm.io/npm:@jridgewell/resolve-uri@3.1.1/dist/resolve-uri.umd.js",
       "@jridgewell/set-array": "https://ga.jspm.io/npm:@jridgewell/set-array@1.1.2/dist/set-array.umd.js",
       "@jridgewell/sourcemap-codec": "https://ga.jspm.io/npm:@jridgewell/sourcemap-codec@1.4.15/dist/sourcemap-codec.umd.js",
       "@jridgewell/trace-mapping": "https://ga.jspm.io/npm:@jridgewell/trace-mapping@0.3.20/dist/trace-mapping.umd.js",
       "ansi-styles": "https://ga.jspm.io/npm:ansi-styles@3.2.1/index.js",
-      "browserslist": "https://ga.jspm.io/npm:browserslist@4.22.1/index.js",
+      "browserslist": "https://ga.jspm.io/npm:browserslist@4.22.2/index.js",
       "buffer": "https://ga.jspm.io/npm:@jspm/core@2.0.1/nodelibs/browser/buffer.js",
-      "caniuse-lite/dist/unpacker/agents": "https://ga.jspm.io/npm:caniuse-lite@1.0.30001563/dist/unpacker/agents.js",
+      "caniuse-lite/dist/unpacker/agents": "https://ga.jspm.io/npm:caniuse-lite@1.0.30001566/dist/unpacker/agents.js",
       "chalk": "https://ga.jspm.io/npm:chalk@2.4.2/index.js",
       "color-convert": "https://ga.jspm.io/npm:color-convert@1.9.3/index.js",
       "color-name": "https://ga.jspm.io/npm:color-name@1.1.3/index.js",
       "convert-source-map": "https://ga.jspm.io/npm:convert-source-map@2.0.0/index.js",
       "debug": "https://ga.jspm.io/npm:debug@4.3.4/src/browser.js",
-      "electron-to-chromium/versions": "https://ga.jspm.io/npm:electron-to-chromium@1.4.585/versions.js",
+      "electron-to-chromium/versions": "https://ga.jspm.io/npm:electron-to-chromium@1.4.609/versions.js",
       "escape-string-regexp": "https://ga.jspm.io/npm:escape-string-regexp@1.0.5/index.js",
       "fs": "https://ga.jspm.io/npm:@jspm/core@2.0.1/nodelibs/browser/fs.js",
       "gensync": "https://ga.jspm.io/npm:gensync@1.0.0-beta.2/index.js",
@@ -84,8 +84,8 @@
       "jsesc": "https://ga.jspm.io/npm:jsesc@2.5.2/jsesc.js",
       "lru-cache": "https://ga.jspm.io/npm:lru-cache@5.1.1/index.js",
       "ms": "https://ga.jspm.io/npm:ms@2.1.2/index.js",
-      "node-releases/data/processed/envs.json": "https://ga.jspm.io/npm:node-releases@2.0.13/data/processed/envs.json.js",
-      "node-releases/data/release-schedule/release-schedule.json": "https://ga.jspm.io/npm:node-releases@2.0.13/data/release-schedule/release-schedule.json.js",
+      "node-releases/data/processed/envs.json": "https://ga.jspm.io/npm:node-releases@2.0.14/data/processed/envs.json.js",
+      "node-releases/data/release-schedule/release-schedule.json": "https://ga.jspm.io/npm:node-releases@2.0.14/data/release-schedule/release-schedule.json.js",
       "path": "https://ga.jspm.io/npm:@jspm/core@2.0.1/nodelibs/browser/path.js",
       "process": "https://ga.jspm.io/npm:@jspm/core@2.0.1/nodelibs/browser/process-production.js",
       "semver": "https://ga.jspm.io/npm:semver@6.3.1/semver.js",