diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index aa1ec87..0f3b9fb 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -20,6 +20,6 @@ jobs:
       with:
         go-version-file: '.go-version'
     - name: golangci-lint
-      uses: golangci/golangci-lint-action@v3
+      uses: golangci/golangci-lint-action@v6
       with:
-        version: v1.54.2
+        version: v1.59.1
diff --git a/lock/provider_downloader_test.go b/lock/provider_downloader_test.go
index 761cc61..2f34d24 100644
--- a/lock/provider_downloader_test.go
+++ b/lock/provider_downloader_test.go
@@ -29,11 +29,11 @@ fc5bbdd0a1bd6715b9afddf3aba6acc494425d77015c19579b9a9fa950e532b2  terraform-prov
 `)
 
 	mux, mockServerURL := newMockServer()
-	mux.HandleFunc(downloadPath, func(w http.ResponseWriter, r *http.Request) {
+	mux.HandleFunc(downloadPath, func(w http.ResponseWriter, _ *http.Request) {
 		w.WriteHeader(200)
 		_, _ = w.Write(zipData)
 	})
-	mux.HandleFunc(shaSumsPath, func(w http.ResponseWriter, r *http.Request) {
+	mux.HandleFunc(shaSumsPath, func(w http.ResponseWriter, _ *http.Request) {
 		w.WriteHeader(200)
 		_, _ = w.Write(shaSumsData)
 	})
@@ -157,7 +157,7 @@ func TestProviderDownloaderClientDownload(t *testing.T) {
 				api: &mockTFRegistryClient{},
 			}
 			client := newTestClient(mockServerURL, config)
-			mux.HandleFunc(tc.subPath, func(w http.ResponseWriter, r *http.Request) {
+			mux.HandleFunc(tc.subPath, func(w http.ResponseWriter, _ *http.Request) {
 				w.WriteHeader(tc.code)
 				_, _ = w.Write(tc.res)
 			})
diff --git a/tfregistry/module_latest_test.go b/tfregistry/module_latest_test.go
index a0dd7b2..67b6693 100644
--- a/tfregistry/module_latest_test.go
+++ b/tfregistry/module_latest_test.go
@@ -87,7 +87,7 @@ func TestModuleLatestForProvider(t *testing.T) {
 			mux, mockServerURL := newMockServer()
 			client := newTestClient(mockServerURL)
 			subPath := fmt.Sprintf("%s%s/%s/%s", moduleV1Service, tc.req.Namespace, tc.req.Name, tc.req.Provider)
-			mux.HandleFunc(subPath, func(w http.ResponseWriter, r *http.Request) {
+			mux.HandleFunc(subPath, func(w http.ResponseWriter, _ *http.Request) {
 				w.WriteHeader(tc.code)
 				fmt.Fprint(w, tc.res)
 			})
diff --git a/tfregistry/provider_latest_test.go b/tfregistry/provider_latest_test.go
index 4aaf9d0..ccedba2 100644
--- a/tfregistry/provider_latest_test.go
+++ b/tfregistry/provider_latest_test.go
@@ -71,7 +71,7 @@ func TestProviderLatest(t *testing.T) {
 			mux, mockServerURL := newMockServer()
 			client := newTestClient(mockServerURL)
 			subPath := fmt.Sprintf("%s%s/%s", providerV1Service, tc.req.Namespace, tc.req.Type)
-			mux.HandleFunc(subPath, func(w http.ResponseWriter, r *http.Request) {
+			mux.HandleFunc(subPath, func(w http.ResponseWriter, _ *http.Request) {
 				w.WriteHeader(tc.code)
 				fmt.Fprint(w, tc.res)
 			})
diff --git a/tfregistry/provider_package_metadata_test.go b/tfregistry/provider_package_metadata_test.go
index cd263c4..d261cfa 100644
--- a/tfregistry/provider_package_metadata_test.go
+++ b/tfregistry/provider_package_metadata_test.go
@@ -127,7 +127,7 @@ func TestProviderPackageMetadata(t *testing.T) {
 			mux, mockServerURL := newMockServer()
 			client := newTestClient(mockServerURL)
 			subPath := fmt.Sprintf("%s%s/%s/%s/download/%s/%s", providerV1Service, tc.req.Namespace, tc.req.Type, tc.req.Version, tc.req.OS, tc.req.Arch)
-			mux.HandleFunc(subPath, func(w http.ResponseWriter, r *http.Request) {
+			mux.HandleFunc(subPath, func(w http.ResponseWriter, _ *http.Request) {
 				w.WriteHeader(tc.code)
 				fmt.Fprint(w, tc.res)
 			})