diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 511b27234..704eabdf9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: ["1.15"]
+        go-version:
+          - '1.20.x'
+          - '1.21.x'
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0c827639a..06175aa06 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
         with:
-          go-version: '1.19'
+          go-version: '1.20.x'
 
       - name: Import GPG Key
         id: import_gpg
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1936a39eb..1515a4fcb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,7 +8,7 @@ Exercism would be impossible without people like you being willing to spend time
 
 ## Dependencies
 
-You'll need Go version 1.11 or higher. Follow the directions on http://golang.org/doc/install
+You'll need Go version 1.20 or higher. Follow the directions on http://golang.org/doc/install
 
 ## Development
 
diff --git a/api/api.go b/api/api.go
index 342ce4230..25b5e9d14 100644
--- a/api/api.go
+++ b/api/api.go
@@ -2,7 +2,7 @@ package api
 
 import (
 	"bytes"
-	"io/ioutil"
+	"os"
 
 	"golang.org/x/net/html/charset"
 	"golang.org/x/text/transform"
@@ -17,7 +17,7 @@ var (
 )
 
 func readFileAsUTF8String(filename string) (*string, error) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
diff --git a/cli/asset.go b/cli/asset.go
index 246895faa..10bbab051 100644
--- a/cli/asset.go
+++ b/cli/asset.go
@@ -3,7 +3,7 @@ package cli
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 )
 
@@ -28,7 +28,7 @@ func (a *Asset) download() (*bytes.Reader, error) {
 	}
 	defer res.Body.Close()
 
-	bs, err := ioutil.ReadAll(res.Body)
+	bs, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/cli/cli.go b/cli/cli.go
index 4312eb018..fe113ec5b 100644
--- a/cli/cli.go
+++ b/cli/cli.go
@@ -8,8 +8,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
+	"os"
 	"runtime"
 	"strings"
 	"time"
@@ -161,8 +161,8 @@ func (c *CLI) fetchLatestRelease() error {
 	return nil
 }
 
-func extractBinary(source *bytes.Reader, os string) (binary io.ReadCloser, err error) {
-	if os == "windows" {
+func extractBinary(source *bytes.Reader, platform string) (binary io.ReadCloser, err error) {
+	if platform == "windows" {
 		zr, err := zip.NewReader(source, int64(source.Len()))
 		if err != nil {
 			return nil, err
@@ -191,7 +191,7 @@ func extractBinary(source *bytes.Reader, os string) (binary io.ReadCloser, err e
 			if err != nil {
 				return nil, err
 			}
-			tmpfile, err := ioutil.TempFile("", "temp-exercism")
+			tmpfile, err := os.CreateTemp("", "temp-exercism")
 			if err != nil {
 				return nil, err
 			}
diff --git a/cmd/cmd_test.go b/cmd/cmd_test.go
index fee08cd98..782be18d2 100644
--- a/cmd/cmd_test.go
+++ b/cmd/cmd_test.go
@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -63,7 +62,7 @@ type CommandTest struct {
 // The method takes a *testing.T as an argument, that way the method can
 // fail the test if the creation of the temporary directory fails.
 func (test *CommandTest) Setup(t *testing.T) {
-	dir, err := ioutil.TempDir("", "command-test")
+	dir, err := os.MkdirTemp("", "command-test")
 	defer os.RemoveAll(dir)
 	assert.NoError(t, err)
 
@@ -104,8 +103,8 @@ func newCapturedOutput() capturedOutput {
 	return capturedOutput{
 		oldOut: Out,
 		oldErr: Err,
-		newOut: ioutil.Discard,
-		newErr: ioutil.Discard,
+		newOut: io.Discard,
+		newErr: io.Discard,
 	}
 }
 
diff --git a/cmd/configure_test.go b/cmd/configure_test.go
index 7a0f28eac..df3542328 100644
--- a/cmd/configure_test.go
+++ b/cmd/configure_test.go
@@ -1,11 +1,9 @@
 //go:build !windows
-// +build !windows
 
 package cmd
 
 import (
 	"bytes"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -344,7 +342,7 @@ func TestConfigureDefaultWorkspaceWithoutClobbering(t *testing.T) {
 	ts := httptest.NewServer(endpoint)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "no-clobber")
+	tmpDir, err := os.MkdirTemp("", "no-clobber")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -379,7 +377,7 @@ func TestConfigureExplicitWorkspaceWithoutClobberingNonDirectory(t *testing.T) {
 	co.override()
 	defer co.reset()
 
-	tmpDir, err := ioutil.TempDir("", "no-clobber")
+	tmpDir, err := os.MkdirTemp("", "no-clobber")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -396,7 +394,7 @@ func TestConfigureExplicitWorkspaceWithoutClobberingNonDirectory(t *testing.T) {
 	}
 
 	// Create a file at the workspace directory's location
-	err = ioutil.WriteFile(filepath.Join(tmpDir, "workspace"), []byte("This is not a directory"), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(tmpDir, "workspace"), []byte("This is not a directory"), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	flags := pflag.NewFlagSet("fake", pflag.PanicOnError)
diff --git a/cmd/download.go b/cmd/download.go
index 7bf278bff..f376e959b 100644
--- a/cmd/download.go
+++ b/cmd/download.go
@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	netURL "net/url"
 	"os"
@@ -202,8 +201,8 @@ func newDownload(flags *pflag.FlagSet, usrCfg *viper.Viper) (*download, error) {
 		return nil, decodedAPIError(res)
 	}
 
-	body, _ := ioutil.ReadAll(res.Body)
-	res.Body = ioutil.NopCloser(bytes.NewReader(body))
+	body, _ := io.ReadAll(res.Body)
+	res.Body = io.NopCloser(bytes.NewReader(body))
 
 	if err := json.Unmarshal(body, &d.payload); err != nil {
 		return nil, decodedAPIError(res)
diff --git a/cmd/download_test.go b/cmd/download_test.go
index 676d90518..d95729719 100644
--- a/cmd/download_test.go
+++ b/cmd/download_test.go
@@ -3,7 +3,6 @@ package cmd
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -169,7 +168,7 @@ func TestDownload(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		tmpDir, err := ioutil.TempDir("", "download-cmd")
+		tmpDir, err := os.MkdirTemp("", "download-cmd")
 		defer os.RemoveAll(tmpDir)
 		assert.NoError(t, err)
 
@@ -197,7 +196,7 @@ func TestDownload(t *testing.T) {
 		assertDownloadedCorrectFiles(t, targetDir)
 
 		dir := filepath.Join(targetDir, "bogus-track", "bogus-exercise")
-		b, err := ioutil.ReadFile(workspace.NewExerciseFromDir(dir).MetadataFilepath())
+		b, err := os.ReadFile(workspace.NewExerciseFromDir(dir).MetadataFilepath())
 		assert.NoError(t, err)
 		var metadata workspace.ExerciseMetadata
 		err = json.Unmarshal(b, &metadata)
@@ -229,7 +228,7 @@ func TestDownloadToExistingDirectory(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		tmpDir, err := ioutil.TempDir("", "download-cmd")
+		tmpDir, err := os.MkdirTemp("", "download-cmd")
 		defer os.RemoveAll(tmpDir)
 		assert.NoError(t, err)
 
@@ -281,7 +280,7 @@ func TestDownloadToExistingDirectoryWithForce(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		tmpDir, err := ioutil.TempDir("", "download-cmd")
+		tmpDir, err := os.MkdirTemp("", "download-cmd")
 		defer os.RemoveAll(tmpDir)
 		assert.NoError(t, err)
 
@@ -363,7 +362,7 @@ func assertDownloadedCorrectFiles(t *testing.T, targetDir string) {
 
 	for _, file := range expectedFiles {
 		t.Run(file.desc, func(t *testing.T) {
-			b, err := ioutil.ReadFile(file.path)
+			b, err := os.ReadFile(file.path)
 			assert.NoError(t, err)
 			assert.Equal(t, file.contents, string(b))
 		})
@@ -383,7 +382,7 @@ func TestDownloadError(t *testing.T) {
 	ts := httptest.NewServer(handler)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "submit-err-tmp-dir")
+	tmpDir, err := os.MkdirTemp("", "submit-err-tmp-dir")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
diff --git a/cmd/submit_symlink_test.go b/cmd/submit_symlink_test.go
index e10fb4890..093895fb3 100644
--- a/cmd/submit_symlink_test.go
+++ b/cmd/submit_symlink_test.go
@@ -1,10 +1,8 @@
 //go:build !windows
-// +build !windows
 
 package cmd
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -25,12 +23,12 @@ func TestSubmitFilesInSymlinkedPath(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "symlink-destination")
+	tmpDir, err := os.MkdirTemp("", "symlink-destination")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 	dstDir := filepath.Join(tmpDir, "workspace")
 
-	srcDir, err := ioutil.TempDir("", "symlink-source")
+	srcDir, err := os.MkdirTemp("", "symlink-source")
 	defer os.RemoveAll(srcDir)
 	assert.NoError(t, err)
 
@@ -53,7 +51,7 @@ func TestSubmitFilesInSymlinkedPath(t *testing.T) {
 	}
 
 	file := filepath.Join(dir, "file.txt")
-	err = ioutil.WriteFile(filepath.Join(dir, "file.txt"), []byte("This is a file."), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(dir, "file.txt"), []byte("This is a file."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	err = runSubmit(cfg, pflag.NewFlagSet("symlinks", pflag.PanicOnError), []string{file})
diff --git a/cmd/submit_test.go b/cmd/submit_test.go
index ea16b6543..2a12d0bca 100644
--- a/cmd/submit_test.go
+++ b/cmd/submit_test.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"mime"
 	"net/http"
 	"net/http/httptest"
@@ -49,7 +49,7 @@ func TestSubmitWithoutWorkspace(t *testing.T) {
 }
 
 func TestSubmitNonExistentFile(t *testing.T) {
-	tmpDir, err := ioutil.TempDir("", "submit-no-such-file")
+	tmpDir, err := os.MkdirTemp("", "submit-no-such-file")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -64,10 +64,10 @@ func TestSubmitNonExistentFile(t *testing.T) {
 		DefaultBaseURL:  "http://example.com",
 	}
 
-	err = ioutil.WriteFile(filepath.Join(tmpDir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(tmpDir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(filepath.Join(tmpDir, "file-2.txt"), []byte("This is file 2"), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(tmpDir, "file-2.txt"), []byte("This is file 2"), os.FileMode(0755))
 	assert.NoError(t, err)
 	files := []string{
 		filepath.Join(tmpDir, "file-1.txt"),
@@ -81,7 +81,7 @@ func TestSubmitNonExistentFile(t *testing.T) {
 }
 
 func TestSubmitExerciseWithoutMetadataFile(t *testing.T) {
-	tmpDir, err := ioutil.TempDir("", "no-metadata-file")
+	tmpDir, err := os.MkdirTemp("", "no-metadata-file")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -89,7 +89,7 @@ func TestSubmitExerciseWithoutMetadataFile(t *testing.T) {
 	os.MkdirAll(dir, os.FileMode(0755))
 
 	file := filepath.Join(dir, "file.txt")
-	err = ioutil.WriteFile(file, []byte("This is a file."), os.FileMode(0755))
+	err = os.WriteFile(file, []byte("This is a file."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	v := viper.New()
@@ -111,7 +111,7 @@ func TestSubmitExerciseWithoutMetadataFile(t *testing.T) {
 
 func TestGetExerciseSolutionFiles(t *testing.T) {
 
-	tmpDir, err := ioutil.TempDir("", "dir-with-no-metadata")
+	tmpDir, err := os.MkdirTemp("", "dir-with-no-metadata")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -120,7 +120,7 @@ func TestGetExerciseSolutionFiles(t *testing.T) {
 		assert.Regexp(t, "no files to submit", err.Error())
 	}
 
-	validTmpDir, err := ioutil.TempDir("", "dir-with-valid-metadata")
+	validTmpDir, err := os.MkdirTemp("", "dir-with-valid-metadata")
 	defer os.RemoveAll(validTmpDir)
 	assert.NoError(t, err)
 
@@ -128,7 +128,7 @@ func TestGetExerciseSolutionFiles(t *testing.T) {
 	err = os.MkdirAll(metadataDir, os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(
+	err = os.WriteFile(
 		filepath.Join(metadataDir, "config.json"),
 		[]byte(`
 {
@@ -149,7 +149,7 @@ func TestGetExerciseSolutionFiles(t *testing.T) {
 }
 
 func TestSubmitFilesAndDir(t *testing.T) {
-	tmpDir, err := ioutil.TempDir("", "submit-no-such-file")
+	tmpDir, err := os.MkdirTemp("", "submit-no-such-file")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -164,10 +164,10 @@ func TestSubmitFilesAndDir(t *testing.T) {
 		DefaultBaseURL:  "http://example.com",
 	}
 
-	err = ioutil.WriteFile(filepath.Join(tmpDir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(tmpDir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(filepath.Join(tmpDir, "file-2.txt"), []byte("This is file 2"), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(tmpDir, "file-2.txt"), []byte("This is file 2"), os.FileMode(0755))
 	assert.NoError(t, err)
 	files := []string{
 		filepath.Join(tmpDir, "file-1.txt"),
@@ -192,7 +192,7 @@ func TestDuplicateFiles(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "duplicate-files")
+	tmpDir, err := os.MkdirTemp("", "duplicate-files")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -212,7 +212,7 @@ func TestDuplicateFiles(t *testing.T) {
 	}
 
 	file1 := filepath.Join(dir, "file-1.txt")
-	err = ioutil.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
+	err = os.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
 
 	err = runSubmit(cfg, pflag.NewFlagSet("fake", pflag.PanicOnError), []string{file1, file1})
 	assert.NoError(t, err)
@@ -232,7 +232,7 @@ func TestSubmitFiles(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "submit-files")
+	tmpDir, err := os.MkdirTemp("", "submit-files")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -241,16 +241,16 @@ func TestSubmitFiles(t *testing.T) {
 	writeFakeMetadata(t, dir, "bogus-track", "bogus-exercise")
 
 	file1 := filepath.Join(dir, "file-1.txt")
-	err = ioutil.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
+	err = os.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	file2 := filepath.Join(dir, "subdir", "file-2.txt")
-	err = ioutil.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
+	err = os.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	// We don't filter *.md files if you explicitly pass the file path.
 	readme := filepath.Join(dir, "README.md")
-	err = ioutil.WriteFile(readme, []byte("This is the readme."), os.FileMode(0755))
+	err = os.WriteFile(readme, []byte("This is the readme."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	v := viper.New()
@@ -289,7 +289,7 @@ func TestLegacyMetadataMigration(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "legacy-metadata-file")
+	tmpDir, err := os.MkdirTemp("", "legacy-metadata-file")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -306,11 +306,11 @@ func TestLegacyMetadataMigration(t *testing.T) {
 	b, err := json.Marshal(metadata)
 	assert.NoError(t, err)
 	exercise := workspace.NewExerciseFromDir(dir)
-	err = ioutil.WriteFile(exercise.LegacyMetadataFilepath(), b, os.FileMode(0600))
+	err = os.WriteFile(exercise.LegacyMetadataFilepath(), b, os.FileMode(0600))
 	assert.NoError(t, err)
 
 	file := filepath.Join(dir, "file.txt")
-	err = ioutil.WriteFile(file, []byte("This is a file."), os.FileMode(0755))
+	err = os.WriteFile(file, []byte("This is a file."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	v := viper.New()
@@ -352,7 +352,7 @@ func TestSubmitWithEmptyFile(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "empty-file")
+	tmpDir, err := os.MkdirTemp("", "empty-file")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -372,9 +372,9 @@ func TestSubmitWithEmptyFile(t *testing.T) {
 	}
 
 	file1 := filepath.Join(dir, "file-1.txt")
-	err = ioutil.WriteFile(file1, []byte(""), os.FileMode(0755))
+	err = os.WriteFile(file1, []byte(""), os.FileMode(0755))
 	file2 := filepath.Join(dir, "file-2.txt")
-	err = ioutil.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
+	err = os.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
 
 	err = runSubmit(cfg, pflag.NewFlagSet("fake", pflag.PanicOnError), []string{file1, file2})
 	assert.NoError(t, err)
@@ -393,7 +393,7 @@ func TestSubmitWithEnormousFile(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "enormous-file")
+	tmpDir, err := os.MkdirTemp("", "enormous-file")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -413,7 +413,7 @@ func TestSubmitWithEnormousFile(t *testing.T) {
 	}
 
 	file := filepath.Join(dir, "file.txt")
-	err = ioutil.WriteFile(file, make([]byte, 65535), os.FileMode(0755))
+	err = os.WriteFile(file, make([]byte, 65535), os.FileMode(0755))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -435,7 +435,7 @@ func TestSubmitFilesForTeamExercise(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "submit-files")
+	tmpDir, err := os.MkdirTemp("", "submit-files")
 	assert.NoError(t, err)
 
 	dir := filepath.Join(tmpDir, "teams", "bogus-team", "bogus-track", "bogus-exercise")
@@ -443,11 +443,11 @@ func TestSubmitFilesForTeamExercise(t *testing.T) {
 	writeFakeMetadata(t, dir, "bogus-track", "bogus-exercise")
 
 	file1 := filepath.Join(dir, "file-1.txt")
-	err = ioutil.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
+	err = os.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	file2 := filepath.Join(dir, "subdir", "file-2.txt")
-	err = ioutil.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
+	err = os.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	v := viper.New()
@@ -477,7 +477,7 @@ func TestSubmitOnlyEmptyFile(t *testing.T) {
 	co.override()
 	defer co.reset()
 
-	tmpDir, err := ioutil.TempDir("", "just-an-empty-file")
+	tmpDir, err := os.MkdirTemp("", "just-an-empty-file")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -497,7 +497,7 @@ func TestSubmitOnlyEmptyFile(t *testing.T) {
 	}
 
 	file := filepath.Join(dir, "file.txt")
-	err = ioutil.WriteFile(file, []byte(""), os.FileMode(0755))
+	err = os.WriteFile(file, []byte(""), os.FileMode(0755))
 
 	err = runSubmit(cfg, pflag.NewFlagSet("fake", pflag.PanicOnError), []string{file})
 	if assert.Error(t, err) {
@@ -506,7 +506,7 @@ func TestSubmitOnlyEmptyFile(t *testing.T) {
 }
 
 func TestSubmitFilesFromDifferentSolutions(t *testing.T) {
-	tmpDir, err := ioutil.TempDir("", "dir-1-submit")
+	tmpDir, err := os.MkdirTemp("", "dir-1-submit")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -519,11 +519,11 @@ func TestSubmitFilesFromDifferentSolutions(t *testing.T) {
 	writeFakeMetadata(t, dir2, "bogus-track", "bogus-exercise-2")
 
 	file1 := filepath.Join(dir1, "file-1.txt")
-	err = ioutil.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
+	err = os.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	file2 := filepath.Join(dir2, "file-2.txt")
-	err = ioutil.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
+	err = os.WriteFile(file2, []byte("This is file 2."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	v := viper.New()
@@ -558,7 +558,7 @@ func fakeSubmitServer(t *testing.T, submittedFiles map[string]string) *httptest.
 				t.Fatal(err)
 			}
 			defer file.Close()
-			body, err := ioutil.ReadAll(file)
+			body, err := io.ReadAll(file)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -589,7 +589,7 @@ func TestSubmitRelativePath(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "relative-path")
+	tmpDir, err := os.MkdirTemp("", "relative-path")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -608,7 +608,7 @@ func TestSubmitRelativePath(t *testing.T) {
 		UserViperConfig: v,
 	}
 
-	err = ioutil.WriteFile(filepath.Join(dir, "file.txt"), []byte("This is a file."), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(dir, "file.txt"), []byte("This is a file."), os.FileMode(0755))
 
 	err = os.Chdir(dir)
 	assert.NoError(t, err)
@@ -629,7 +629,7 @@ func TestSubmitServerErr(t *testing.T) {
 	ts := httptest.NewServer(handler)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "submit-err-tmp-dir")
+	tmpDir, err := os.MkdirTemp("", "submit-err-tmp-dir")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -648,7 +648,7 @@ func TestSubmitServerErr(t *testing.T) {
 	os.MkdirAll(filepath.Join(dir, "subdir"), os.FileMode(0755))
 	writeFakeMetadata(t, dir, "bogus-track", "bogus-exercise")
 
-	err = ioutil.WriteFile(filepath.Join(dir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(dir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	files := []string{
@@ -668,7 +668,7 @@ func TestHandleErrorResponse(t *testing.T) {
 	ts := httptest.NewServer(handler)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "submit-nonsuccess")
+	tmpDir, err := os.MkdirTemp("", "submit-nonsuccess")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -687,7 +687,7 @@ func TestHandleErrorResponse(t *testing.T) {
 	os.MkdirAll(filepath.Join(dir, "subdir"), os.FileMode(0755))
 	writeFakeMetadata(t, dir, "bogus-track", "bogus-exercise")
 
-	err = ioutil.WriteFile(filepath.Join(dir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
+	err = os.WriteFile(filepath.Join(dir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	files := []string{
@@ -703,7 +703,7 @@ func TestSubmissionNotConnectedToRequesterAccount(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "submit-files")
+	tmpDir, err := os.MkdirTemp("", "submit-files")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -721,7 +721,7 @@ func TestSubmissionNotConnectedToRequesterAccount(t *testing.T) {
 	assert.NoError(t, err)
 
 	file1 := filepath.Join(dir, "file-1.txt")
-	err = ioutil.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
+	err = os.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	v := viper.New()
@@ -746,7 +746,7 @@ func TestExerciseDirnameMatchesMetadataSlug(t *testing.T) {
 	ts := fakeSubmitServer(t, submittedFiles)
 	defer ts.Close()
 
-	tmpDir, err := ioutil.TempDir("", "submit-files")
+	tmpDir, err := os.MkdirTemp("", "submit-files")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -755,7 +755,7 @@ func TestExerciseDirnameMatchesMetadataSlug(t *testing.T) {
 	writeFakeMetadata(t, dir, "bogus-track", "bogus-exercise")
 
 	file1 := filepath.Join(dir, "file-1.txt")
-	err = ioutil.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
+	err = os.WriteFile(file1, []byte("This is file 1."), os.FileMode(0755))
 	assert.NoError(t, err)
 
 	v := viper.New()
diff --git a/config/config_notwin_test.go b/config/config_notwin_test.go
index 31ddf77f0..33912cc9b 100644
--- a/config/config_notwin_test.go
+++ b/config/config_notwin_test.go
@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package config
 
diff --git a/config/config_windows_test.go b/config/config_windows_test.go
index da676739f..5757b783f 100644
--- a/config/config_windows_test.go
+++ b/config/config_windows_test.go
@@ -1,5 +1,4 @@
 //go:build windows
-// +build windows
 
 package config
 
diff --git a/config/resolve_notwin_test.go b/config/resolve_notwin_test.go
index eea7ae440..fb70d5f69 100644
--- a/config/resolve_notwin_test.go
+++ b/config/resolve_notwin_test.go
@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package config
 
diff --git a/debug/debug.go b/debug/debug.go
index 133681439..a96d1f3bd 100644
--- a/debug/debug.go
+++ b/debug/debug.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"net/http/httputil"
@@ -42,7 +41,7 @@ func DumpRequest(req *http.Request) {
 
 	var bodyCopy bytes.Buffer
 	body := io.TeeReader(req.Body, &bodyCopy)
-	req.Body = ioutil.NopCloser(body)
+	req.Body = io.NopCloser(body)
 
 	authHeader := req.Header.Get("Authorization")
 
@@ -63,7 +62,7 @@ func DumpRequest(req *http.Request) {
 	Println("")
 
 	req.Header.Set("Authorization", authHeader)
-	req.Body = ioutil.NopCloser(&bodyCopy)
+	req.Body = io.NopCloser(&bodyCopy)
 }
 
 // DumpResponse dumps out the provided http.Response
@@ -74,7 +73,7 @@ func DumpResponse(res *http.Response) {
 
 	var bodyCopy bytes.Buffer
 	body := io.TeeReader(res.Body, &bodyCopy)
-	res.Body = ioutil.NopCloser(body)
+	res.Body = io.NopCloser(body)
 
 	dump, err := httputil.DumpResponse(res, res.ContentLength > 0)
 	if err != nil {
@@ -86,7 +85,7 @@ func DumpResponse(res *http.Response) {
 	Println("========================= END DumpResponse =========================")
 	Println("")
 
-	res.Body = ioutil.NopCloser(body)
+	res.Body = io.NopCloser(body)
 }
 
 // Redact masks the given token by replacing part of the string with *
diff --git a/go.mod b/go.mod
index 91e79ff1a..c6a4a02a2 100644
--- a/go.mod
+++ b/go.mod
@@ -1,28 +1,33 @@
 module github.com/exercism/cli
 
-go 1.15
+go 1.20
 
 require (
 	github.com/blang/semver v3.5.1+incompatible
-	github.com/davecgh/go-spew v1.1.0
-	github.com/fsnotify/fsnotify v1.4.2
-	github.com/hashicorp/hcl v0.0.0-20170509225359-392dba7d905e
 	github.com/inconshreveable/go-update v0.0.0-20160112193335-8152e7eb6ccf
-	github.com/inconshreveable/mousetrap v1.0.0
-	github.com/magiconair/properties v1.7.3
-	github.com/mitchellh/mapstructure v0.0.0-20170523030023-d0303fe80992
-	github.com/pelletier/go-buffruneio v0.2.0
-	github.com/pelletier/go-toml v1.0.0
-	github.com/pmezard/go-difflib v1.0.0
-	github.com/spf13/afero v0.0.0-20170217164146-9be650865eab
-	github.com/spf13/cast v1.1.0
-	github.com/spf13/cobra v0.0.0-20170731170427-b26b538f6930
-	github.com/spf13/jwalterweatherman v0.0.0-20170523133247-0efa5202c046
-	github.com/spf13/pflag v1.0.0
-	github.com/spf13/viper v0.0.0-20180507071007-15738813a09d
-	github.com/stretchr/testify v1.1.4
-	golang.org/x/net v0.0.0-20170726083632-f5079bd7f6f7
-	golang.org/x/sys v0.0.0-20201202213521-69691e467435
-	golang.org/x/text v0.0.0-20170730040918-3bd178b88a81
-	gopkg.in/yaml.v2 v2.0.0-20170721122051-25c4ec802a7d
+	github.com/spf13/cobra v1.7.0
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.15.0
+	github.com/stretchr/testify v1.8.4
+	golang.org/x/net v0.4.0
+	golang.org/x/text v0.5.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.6 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/afero v1.9.3 // indirect
+	github.com/spf13/cast v1.5.0 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/subosito/gotenv v1.4.2 // indirect
+	golang.org/x/sys v0.3.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 7d53fd399..bc3b4c47c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,46 +1,492 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.44.3/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.75.0/go.mod h1:VGuuCn7PG0dwsd5XPVm2Mm3wlh3EL55/79EKB6hlPTY=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
+cloud.google.com/go/storage v1.14.0/go.mod h1:GrKmX003DSIwi9o29oFT7YDnHYwZoctc3fOKtUw0Xmo=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/blang/semver v3.5.1+incompatible h1:cQNTCjp13qL8KC3Nbxr/y2Bqb63oX6wdnnjpJbkM4JQ=
 github.com/blang/semver v3.5.1+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fsnotify/fsnotify v1.4.2 h1:v5tKwtf2hNhBV24eNYfQ5UmvFOGlOCmRqk7/P1olxtk=
-github.com/fsnotify/fsnotify v1.4.2/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/hashicorp/hcl v0.0.0-20170509225359-392dba7d905e h1:KJWs1uTCkN3E/J5ofCH9Pf8KKsibTFc3fv0CA9+WsVo=
-github.com/hashicorp/hcl v0.0.0-20170509225359-392dba7d905e/go.mod h1:oZtUIOe8dh44I2q6ScRibXws4Ajl+d+nod3AaR9vL5w=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/go-control-plane v0.9.7/go.mod h1:cwu0lG7PUMfa9snN8LXBig5ynNVH9qI8YYLbd1fK2po=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
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diff --git a/workspace/document_test.go b/workspace/document_test.go
index 4e055df2f..50013ee73 100644
--- a/workspace/document_test.go
+++ b/workspace/document_test.go
@@ -1,7 +1,6 @@
 package workspace
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -10,7 +9,7 @@ import (
 )
 
 func TestNormalizedDocumentPath(t *testing.T) {
-	root, err := ioutil.TempDir("", "docpath")
+	root, err := os.MkdirTemp("", "docpath")
 	assert.NoError(t, err)
 	defer os.RemoveAll(root)
 
@@ -32,7 +31,7 @@ func TestNormalizedDocumentPath(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		err = ioutil.WriteFile(tc.filepath, []byte("a file"), os.FileMode(0600))
+		err = os.WriteFile(tc.filepath, []byte("a file"), os.FileMode(0600))
 		assert.NoError(t, err)
 
 		doc, err := NewDocument(root, tc.filepath)
diff --git a/workspace/exercise_config.go b/workspace/exercise_config.go
index 9b0164ebb..35ae7545c 100644
--- a/workspace/exercise_config.go
+++ b/workspace/exercise_config.go
@@ -3,7 +3,7 @@ package workspace
 import (
 	"encoding/json"
 	"errors"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 )
 
@@ -22,7 +22,7 @@ type ExerciseConfig struct {
 
 // NewExerciseConfig reads exercise metadata from a file in the given directory.
 func NewExerciseConfig(dir string) (*ExerciseConfig, error) {
-	b, err := ioutil.ReadFile(filepath.Join(dir, configFilepath))
+	b, err := os.ReadFile(filepath.Join(dir, configFilepath))
 	if err != nil {
 		return nil, err
 	}
diff --git a/workspace/exercise_config_test.go b/workspace/exercise_config_test.go
index d07264c0d..5d9847453 100644
--- a/workspace/exercise_config_test.go
+++ b/workspace/exercise_config_test.go
@@ -1,7 +1,6 @@
 package workspace
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -11,7 +10,7 @@ import (
 )
 
 func TestExerciseConfig(t *testing.T) {
-	dir, err := ioutil.TempDir("", "exercise_config")
+	dir, err := os.MkdirTemp("", "exercise_config")
 	assert.NoError(t, err)
 	defer os.RemoveAll(dir)
 
@@ -40,7 +39,7 @@ func TestExerciseConfig(t *testing.T) {
 }
 
 func TestExerciseConfigNoTestKey(t *testing.T) {
-	dir, err := ioutil.TempDir("", "exercise_config")
+	dir, err := os.MkdirTemp("", "exercise_config")
 	assert.NoError(t, err)
 	defer os.RemoveAll(dir)
 
@@ -64,7 +63,7 @@ func TestExerciseConfigNoTestKey(t *testing.T) {
 }
 
 func TestMissingExerciseConfig(t *testing.T) {
-	dir, err := ioutil.TempDir("", "exercise_config")
+	dir, err := os.MkdirTemp("", "exercise_config")
 	assert.NoError(t, err)
 	defer os.RemoveAll(dir)
 
@@ -77,7 +76,7 @@ func TestMissingExerciseConfig(t *testing.T) {
 }
 
 func TestInvalidExerciseConfig(t *testing.T) {
-	dir, err := ioutil.TempDir("", "exercise_config")
+	dir, err := os.MkdirTemp("", "exercise_config")
 	assert.NoError(t, err)
 	defer os.RemoveAll(dir)
 
diff --git a/workspace/exercise_metadata.go b/workspace/exercise_metadata.go
index 0a0305576..729174258 100644
--- a/workspace/exercise_metadata.go
+++ b/workspace/exercise_metadata.go
@@ -3,7 +3,6 @@ package workspace
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -32,7 +31,7 @@ type ExerciseMetadata struct {
 
 // NewExerciseMetadata reads exercise metadata from a file in the given directory.
 func NewExerciseMetadata(dir string) (*ExerciseMetadata, error) {
-	b, err := ioutil.ReadFile(filepath.Join(dir, metadataFilepath))
+	b, err := os.ReadFile(filepath.Join(dir, metadataFilepath))
 	if err != nil {
 		return nil, err
 	}
@@ -72,7 +71,7 @@ func (em *ExerciseMetadata) Write(dir string) error {
 	if err = os.MkdirAll(filepath.Dir(metadataAbsoluteFilepath), os.FileMode(0755)); err != nil {
 		return err
 	}
-	if err = ioutil.WriteFile(metadataAbsoluteFilepath, b, os.FileMode(0600)); err != nil {
+	if err = os.WriteFile(metadataAbsoluteFilepath, b, os.FileMode(0600)); err != nil {
 		return err
 	}
 	em.Dir = dir
diff --git a/workspace/exercise_metadata_test.go b/workspace/exercise_metadata_test.go
index e05ffeac3..0c3c7afa7 100644
--- a/workspace/exercise_metadata_test.go
+++ b/workspace/exercise_metadata_test.go
@@ -1,7 +1,6 @@
 package workspace
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 	"time"
@@ -10,7 +9,7 @@ import (
 )
 
 func TestExerciseMetadata(t *testing.T) {
-	dir, err := ioutil.TempDir("", "solution")
+	dir, err := os.MkdirTemp("", "solution")
 	assert.NoError(t, err)
 	defer os.RemoveAll(dir)
 
diff --git a/workspace/exercise_test.go b/workspace/exercise_test.go
index 0a6d1d8fa..7dd15c583 100644
--- a/workspace/exercise_test.go
+++ b/workspace/exercise_test.go
@@ -1,7 +1,6 @@
 package workspace
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -10,7 +9,7 @@ import (
 )
 
 func TestHasMetadata(t *testing.T) {
-	ws, err := ioutil.TempDir("", "fake-workspace")
+	ws, err := os.MkdirTemp("", "fake-workspace")
 	defer os.RemoveAll(ws)
 	assert.NoError(t, err)
 
@@ -22,7 +21,7 @@ func TestHasMetadata(t *testing.T) {
 	err = os.MkdirAll(filepath.Dir(exerciseB.MetadataFilepath()), os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(exerciseA.MetadataFilepath(), []byte{}, os.FileMode(0600))
+	err = os.WriteFile(exerciseA.MetadataFilepath(), []byte{}, os.FileMode(0600))
 	assert.NoError(t, err)
 
 	ok, err := exerciseA.HasMetadata()
@@ -35,7 +34,7 @@ func TestHasMetadata(t *testing.T) {
 }
 
 func TestHasLegacyMetadata(t *testing.T) {
-	ws, err := ioutil.TempDir("", "fake-workspace")
+	ws, err := os.MkdirTemp("", "fake-workspace")
 	defer os.RemoveAll(ws)
 	assert.NoError(t, err)
 
@@ -47,7 +46,7 @@ func TestHasLegacyMetadata(t *testing.T) {
 	err = os.MkdirAll(filepath.Dir(exerciseB.LegacyMetadataFilepath()), os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(exerciseA.LegacyMetadataFilepath(), []byte{}, os.FileMode(0600))
+	err = os.WriteFile(exerciseA.LegacyMetadataFilepath(), []byte{}, os.FileMode(0600))
 	assert.NoError(t, err)
 
 	ok, err := exerciseA.HasLegacyMetadata()
@@ -76,7 +75,7 @@ func TestMigrationStatusString(t *testing.T) {
 }
 
 func TestMigrateLegacyMetadataFileWithoutLegacy(t *testing.T) {
-	ws, err := ioutil.TempDir("", "fake-workspace")
+	ws, err := os.MkdirTemp("", "fake-workspace")
 	defer os.RemoveAll(ws)
 	assert.NoError(t, err)
 
@@ -85,7 +84,7 @@ func TestMigrateLegacyMetadataFileWithoutLegacy(t *testing.T) {
 	err = os.MkdirAll(filepath.Dir(metadataFilepath), os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(metadataFilepath, []byte{}, os.FileMode(0600))
+	err = os.WriteFile(metadataFilepath, []byte{}, os.FileMode(0600))
 	assert.NoError(t, err)
 
 	ok, _ := exercise.HasLegacyMetadata()
@@ -104,7 +103,7 @@ func TestMigrateLegacyMetadataFileWithoutLegacy(t *testing.T) {
 }
 
 func TestMigrateLegacyMetadataFileWithLegacy(t *testing.T) {
-	ws, err := ioutil.TempDir("", "fake-workspace")
+	ws, err := os.MkdirTemp("", "fake-workspace")
 	defer os.RemoveAll(ws)
 	assert.NoError(t, err)
 
@@ -113,7 +112,7 @@ func TestMigrateLegacyMetadataFileWithLegacy(t *testing.T) {
 	err = os.MkdirAll(filepath.Dir(legacyMetadataFilepath), os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(legacyMetadataFilepath, []byte{}, os.FileMode(0600))
+	err = os.WriteFile(legacyMetadataFilepath, []byte{}, os.FileMode(0600))
 	assert.NoError(t, err)
 
 	ok, _ := exercise.HasLegacyMetadata()
@@ -132,7 +131,7 @@ func TestMigrateLegacyMetadataFileWithLegacy(t *testing.T) {
 }
 
 func TestMigrateLegacyMetadataFileWithLegacyAndModern(t *testing.T) {
-	ws, err := ioutil.TempDir("", "fake-workspace")
+	ws, err := os.MkdirTemp("", "fake-workspace")
 	defer os.RemoveAll(ws)
 	assert.NoError(t, err)
 
@@ -144,9 +143,9 @@ func TestMigrateLegacyMetadataFileWithLegacyAndModern(t *testing.T) {
 	err = os.MkdirAll(filepath.Dir(metadataFilepath), os.FileMode(0755))
 	assert.NoError(t, err)
 
-	err = ioutil.WriteFile(legacyMetadataFilepath, []byte{}, os.FileMode(0600))
+	err = os.WriteFile(legacyMetadataFilepath, []byte{}, os.FileMode(0600))
 	assert.NoError(t, err)
-	err = ioutil.WriteFile(metadataFilepath, []byte{}, os.FileMode(0600))
+	err = os.WriteFile(metadataFilepath, []byte{}, os.FileMode(0600))
 	assert.NoError(t, err)
 
 	ok, _ := exercise.HasLegacyMetadata()
diff --git a/workspace/path_type_symlinks_test.go b/workspace/path_type_symlinks_test.go
index ace7b741d..a80b6171a 100644
--- a/workspace/path_type_symlinks_test.go
+++ b/workspace/path_type_symlinks_test.go
@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package workspace
 
diff --git a/workspace/workspace.go b/workspace/workspace.go
index eb9875e8a..0011d4be2 100644
--- a/workspace/workspace.go
+++ b/workspace/workspace.go
@@ -3,7 +3,6 @@ package workspace
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -46,7 +45,7 @@ func New(dir string) (Workspace, error) {
 func (ws Workspace) PotentialExercises() ([]Exercise, error) {
 	exercises := []Exercise{}
 
-	topInfos, err := ioutil.ReadDir(ws.Dir)
+	topInfos, err := os.ReadDir(ws.Dir)
 	if err != nil {
 		return nil, err
 	}
@@ -60,7 +59,7 @@ func (ws Workspace) PotentialExercises() ([]Exercise, error) {
 		}
 
 		if topInfo.Name() == "teams" {
-			subInfos, err := ioutil.ReadDir(filepath.Join(ws.Dir, "teams"))
+			subInfos, err := os.ReadDir(filepath.Join(ws.Dir, "teams"))
 			if err != nil {
 				return nil, err
 			}
@@ -81,7 +80,7 @@ func (ws Workspace) PotentialExercises() ([]Exercise, error) {
 			continue
 		}
 
-		subInfos, err := ioutil.ReadDir(filepath.Join(ws.Dir, topInfo.Name()))
+		subInfos, err := os.ReadDir(filepath.Join(ws.Dir, topInfo.Name()))
 		if err != nil {
 			return nil, err
 		}
diff --git a/workspace/workspace_darwin_test.go b/workspace/workspace_darwin_test.go
index 03794a795..47bcab7ec 100644
--- a/workspace/workspace_darwin_test.go
+++ b/workspace/workspace_darwin_test.go
@@ -2,11 +2,12 @@ package workspace
 
 import (
 	"fmt"
-	"github.com/stretchr/testify/assert"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestExerciseDir_case_insensitive(t *testing.T) {
diff --git a/workspace/workspace_test.go b/workspace/workspace_test.go
index 160c7cd0e..63053a5cd 100644
--- a/workspace/workspace_test.go
+++ b/workspace/workspace_test.go
@@ -1,7 +1,6 @@
 package workspace
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -12,7 +11,7 @@ import (
 )
 
 func TestWorkspacePotentialExercises(t *testing.T) {
-	tmpDir, err := ioutil.TempDir("", "walk")
+	tmpDir, err := os.MkdirTemp("", "walk")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -54,7 +53,7 @@ func TestWorkspacePotentialExercises(t *testing.T) {
 }
 
 func TestWorkspaceExercises(t *testing.T) {
-	tmpDir, err := ioutil.TempDir("", "walk-with-metadata")
+	tmpDir, err := os.MkdirTemp("", "walk-with-metadata")
 	defer os.RemoveAll(tmpDir)
 	assert.NoError(t, err)
 
@@ -69,7 +68,7 @@ func TestWorkspaceExercises(t *testing.T) {
 		assert.NoError(t, err)
 
 		if path != a2 {
-			err = ioutil.WriteFile(metadataAbsoluteFilepath, []byte{}, os.FileMode(0600))
+			err = os.WriteFile(metadataAbsoluteFilepath, []byte{}, os.FileMode(0600))
 			assert.NoError(t, err)
 		}
 	}