diff --git a/api-get-object_test.go b/api-get-object_test.go
index ff2415b4b..846749d2f 100644
--- a/api-get-object_test.go
+++ b/api-get-object_test.go
@@ -27,7 +27,7 @@ import (
 )
 
 func TestGetObjectReturnSuccess(t *testing.T) {
-	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Last-Modified", "Wed, 21 Oct 2015 07:28:00 GMT")
 		w.Header().Set("Content-Length", "5")
 
@@ -61,7 +61,7 @@ func TestGetObjectReturnSuccess(t *testing.T) {
 }
 
 func TestGetObjectReturnErrorIfServerTruncatesResponse(t *testing.T) {
-	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Last-Modified", "Wed, 21 Oct 2015 07:28:00 GMT")
 		w.Header().Set("Content-Length", "100")
 
@@ -90,7 +90,7 @@ func TestGetObjectReturnErrorIfServerTruncatesResponse(t *testing.T) {
 }
 
 func TestGetObjectReturnErrorIfServerTruncatesResponseDouble(t *testing.T) {
-	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Last-Modified", "Wed, 21 Oct 2015 07:28:00 GMT")
 		w.Header().Set("Content-Length", "1024")
 
@@ -119,7 +119,7 @@ func TestGetObjectReturnErrorIfServerTruncatesResponseDouble(t *testing.T) {
 }
 
 func TestGetObjectReturnErrorIfServerSendsMore(t *testing.T) {
-	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Set("Last-Modified", "Wed, 21 Oct 2015 07:28:00 GMT")
 		w.Header().Set("Content-Length", "1")
 
diff --git a/api.go b/api.go
index 6dcee46dd..1c3cb83cd 100644
--- a/api.go
+++ b/api.go
@@ -234,7 +234,7 @@ func privateNew(endpoint string, opts *Options) (*Client, error) {
 	clnt.httpClient = &http.Client{
 		Jar:       jar,
 		Transport: transport,
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		CheckRedirect: func(_ *http.Request, _ []*http.Request) error {
 			return http.ErrUseLastResponse
 		},
 	}
diff --git a/healthcheck_test.go b/healthcheck_test.go
index 54f3c7afc..eb681ff7e 100644
--- a/healthcheck_test.go
+++ b/healthcheck_test.go
@@ -27,7 +27,7 @@ import (
 )
 
 func TestHealthCheck(t *testing.T) {
-	srv := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	srv := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		w.WriteHeader(http.StatusOK)
 	}))
 	defer srv.Close()
diff --git a/pkg/credentials/iam_aws_test.go b/pkg/credentials/iam_aws_test.go
index df6df8574..4089c13ed 100644
--- a/pkg/credentials/iam_aws_test.go
+++ b/pkg/credentials/iam_aws_test.go
@@ -75,14 +75,14 @@ const credsRespStsImpl = `<AssumeRoleWithWebIdentityResponse xmlns="https://sts.
 </AssumeRoleWithWebIdentityResponse>`
 
 func initTestFailServer() *httptest.Server {
-	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		http.Error(w, "Not allowed", http.StatusBadRequest)
 	}))
 	return server
 }
 
 func initTestServerNoRoles() *httptest.Server {
-	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		w.Write([]byte(""))
 	}))
 	return server
@@ -127,7 +127,7 @@ func initIMDSv2Server(expireOn string, failAssume bool) *httptest.Server {
 }
 
 func initEcsTaskTestServer(expireOn string) *httptest.Server {
-	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
 		fmt.Fprintf(w, credsRespEcsTaskTmpl, expireOn)
 	}))