diff --git a/dialer_test.go b/dialer_test.go
index 194a48d4..05244b14 100644
--- a/dialer_test.go
+++ b/dialer_test.go
@@ -283,7 +283,7 @@ func TestDialerWithCustomDialFunc(t *testing.T) {
 	}
 	d, err := NewDialer(context.Background(),
 		WithTokenSource(mock.EmptyTokenSource{}),
-		WithDialFunc(func(ctx context.Context, network, addr string) (net.Conn, error) {
+		WithDialFunc(func(context.Context, string, string) (net.Conn, error) {
 			return nil, errors.New("sentinel error")
 		}),
 	)
diff --git a/e2e_postgres_test.go b/e2e_postgres_test.go
index daaa0928..92c4a14d 100644
--- a/e2e_postgres_test.go
+++ b/e2e_postgres_test.go
@@ -78,7 +78,7 @@ func TestPostgresPgxConnect(t *testing.T) {
 		t.Fatalf("failed to parse pgx config: %v", err)
 	}
 
-	config.DialFunc = func(ctx context.Context, network string, instance string) (net.Conn, error) {
+	config.DialFunc = func(ctx context.Context, _ string, _ string) (net.Conn, error) {
 		return d.Dial(ctx, postgresConnName)
 	}
 
@@ -115,7 +115,7 @@ func TestPostgresConnectWithIAMUser(t *testing.T) {
 		t.Fatalf("failed to initiate Dialer: %v", err)
 	}
 	defer d.Close()
-	config.DialFunc = func(ctx context.Context, network string, instance string) (net.Conn, error) {
+	config.DialFunc = func(ctx context.Context, _ string, _ string) (net.Conn, error) {
 		return d.Dial(ctx, postgresConnName)
 	}
 
@@ -326,7 +326,7 @@ func TestPostgresAuthentication(t *testing.T) {
 				t.Fatalf("failed to parse pgx config: %v", err)
 			}
 
-			config.DialFunc = func(ctx context.Context, network string, instance string) (net.Conn, error) {
+			config.DialFunc = func(ctx context.Context, _ string, _ string) (net.Conn, error) {
 				return d.Dial(ctx, postgresConnName)
 			}
 
diff --git a/internal/mock/sqladmin.go b/internal/mock/sqladmin.go
index 54f32d47..610312e7 100644
--- a/internal/mock/sqladmin.go
+++ b/internal/mock/sqladmin.go
@@ -21,7 +21,7 @@ import (
 	"encoding/json"
 	"encoding/pem"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"sync"
@@ -129,7 +129,7 @@ func InstanceGetSuccess(i FakeCSQLInstance, ct int) *Request {
 		reqMethod: http.MethodGet,
 		reqPath:   fmt.Sprintf("/sql/v1beta4/projects/%s/instances/%s/connectSettings", i.project, i.name),
 		reqCt:     ct,
-		handle: func(resp http.ResponseWriter, req *http.Request) {
+		handle: func(resp http.ResponseWriter, _ *http.Request) {
 			b, err := db.MarshalJSON()
 			if err != nil {
 				http.Error(resp, err.Error(), http.StatusInternalServerError)
@@ -154,7 +154,7 @@ func CreateEphemeralSuccess(i FakeCSQLInstance, ct int) *Request {
 		reqCt:     ct,
 		handle: func(resp http.ResponseWriter, req *http.Request) {
 			// Read the body from the request.
-			b, err := ioutil.ReadAll(req.Body)
+			b, err := io.ReadAll(req.Body)
 			defer req.Body.Close()
 			if err != nil {
 				http.Error(resp, fmt.Errorf("unable to read body: %w", err).Error(), http.StatusBadRequest)