diff --git a/istioctl/pkg/multicluster/remote_secret.go b/istioctl/pkg/multicluster/remote_secret.go
index 5d4eca4704c9..9845cd59898a 100644
--- a/istioctl/pkg/multicluster/remote_secret.go
+++ b/istioctl/pkg/multicluster/remote_secret.go
@@ -509,7 +509,7 @@ func writeToTempFile(content string) (string, error) {
 	}
 	defer func() { _ = outFile.Close() }()
 
-	if _, err := outFile.Write([]byte(content)); err != nil {
+	if _, err := outFile.WriteString(content); err != nil {
 		return "", fmt.Errorf("failed writing manifest file: %v", err)
 	}
 	return outFile.Name(), nil
diff --git a/istioctl/pkg/tag/generate.go b/istioctl/pkg/tag/generate.go
index 072ce5a1e8d1..7b432dac694f 100644
--- a/istioctl/pkg/tag/generate.go
+++ b/istioctl/pkg/tag/generate.go
@@ -401,7 +401,7 @@ func writeToTempFile(content string) (string, error) {
 	}
 	defer func() { _ = outFile.Close() }()
 
-	if _, err := outFile.Write([]byte(content)); err != nil {
+	if _, err := outFile.WriteString(content); err != nil {
 		return "", fmt.Errorf("failed writing manifest file: %w", err)
 	}
 	return outFile.Name(), nil
diff --git a/operator/pkg/object/objects.go b/operator/pkg/object/objects.go
index 902754ee160b..504266cacc76 100644
--- a/operator/pkg/object/objects.go
+++ b/operator/pkg/object/objects.go
@@ -334,7 +334,7 @@ func (os K8sObjects) YAMLManifest() (string, error) {
 		if _, err := b.Write(ym); err != nil {
 			return "", err
 		}
-		if _, err := b.Write([]byte(YAMLSeparator)); err != nil {
+		if _, err := b.WriteString(YAMLSeparator); err != nil {
 			return "", err
 		}
 
diff --git a/pilot/pkg/config/kube/gateway/deploymentcontroller_test.go b/pilot/pkg/config/kube/gateway/deploymentcontroller_test.go
index 4970c60eb3a3..38e050a15dd2 100644
--- a/pilot/pkg/config/kube/gateway/deploymentcontroller_test.go
+++ b/pilot/pkg/config/kube/gateway/deploymentcontroller_test.go
@@ -245,7 +245,7 @@ func TestConfigureIstioGateway(t *testing.T) {
 					return err
 				}
 				buf.Write(b)
-				buf.Write([]byte("---\n"))
+				buf.WriteString("---\n")
 				return nil
 			}
 			client.RunAndWait(stop)
diff --git a/pkg/bootstrap/instance_test.go b/pkg/bootstrap/instance_test.go
index a409db4ef286..318e906ddbe3 100644
--- a/pkg/bootstrap/instance_test.go
+++ b/pkg/bootstrap/instance_test.go
@@ -319,7 +319,7 @@ func TestGolden(t *testing.T) {
 			}
 			defer os.Remove(annoFile.Name())
 			for k, v := range c.annotations {
-				annoFile.Write([]byte(fmt.Sprintf("%s=%q\n", k, v)))
+				annoFile.WriteString(fmt.Sprintf("%s=%q\n", k, v))
 			}
 
 			node, err := GetNodeMetaData(MetadataOptions{
diff --git a/pkg/collateral/control.go b/pkg/collateral/control.go
index 8152ee0606a8..f419ccfe2230 100644
--- a/pkg/collateral/control.go
+++ b/pkg/collateral/control.go
@@ -259,13 +259,13 @@ _complete istio 2>/dev/null
 		defer func() { _ = outFile.Close() }()
 
 		// Concatenate the head, initialization, generated bash, and tail to the file
-		if _, err = outFile.Write([]byte(zshInitialization)); err != nil {
+		if _, err = outFile.WriteString(zshInitialization); err != nil {
 			return fmt.Errorf("unable to output zsh initialization: %v", err)
 		}
 		if err = root.GenBashCompletion(outFile); err != nil {
 			return fmt.Errorf("unable to output zsh completion file: %v", err)
 		}
-		if _, err = outFile.Write([]byte(zshTail)); err != nil {
+		if _, err = outFile.WriteString(zshTail); err != nil {
 			return fmt.Errorf("unable to output zsh tail: %v", err)
 		}
 	}
diff --git a/pkg/test/framework/components/echo/kube/deployment.go b/pkg/test/framework/components/echo/kube/deployment.go
index ea3a99005cc7..33f1656fcfac 100644
--- a/pkg/test/framework/components/echo/kube/deployment.go
+++ b/pkg/test/framework/components/echo/kube/deployment.go
@@ -707,7 +707,7 @@ func customizeVMEnvironment(ctx resource.Context, cfg echo.Config, clusterEnv st
 	if cfg.VMEnvironment != nil {
 		for k, v := range cfg.VMEnvironment {
 			addition := fmt.Sprintf("%s=%s\n", k, v)
-			_, err = f.Write([]byte(addition))
+			_, err = f.WriteString(addition)
 			if err != nil {
 				return fmt.Errorf("failed writing %q to %s: %v", addition, clusterEnv, err)
 			}
@@ -715,7 +715,7 @@ func customizeVMEnvironment(ctx resource.Context, cfg echo.Config, clusterEnv st
 	}
 	if !ctx.Environment().(*kube.Environment).Settings().LoadBalancerSupported {
 		// customize cluster.env with NodePort mapping
-		_, err = f.Write([]byte(fmt.Sprintf("ISTIO_PILOT_PORT=%d\n", istiodAddr.Port())))
+		_, err = f.WriteString(fmt.Sprintf("ISTIO_PILOT_PORT=%d\n", istiodAddr.Port()))
 		if err != nil {
 			return err
 		}
diff --git a/security/pkg/nodeagent/caclient/credentials_test.go b/security/pkg/nodeagent/caclient/credentials_test.go
index f53fcc881bc6..578c0c8b947d 100644
--- a/security/pkg/nodeagent/caclient/credentials_test.go
+++ b/security/pkg/nodeagent/caclient/credentials_test.go
@@ -143,7 +143,7 @@ func writeToTempFile(content, fileNamePrefix string) (string, error) {
 	}
 	defer func() { _ = outFile.Close() }()
 
-	if _, err := outFile.Write([]byte(content)); err != nil {
+	if _, err := outFile.WriteString(content); err != nil {
 		return "", fmt.Errorf("failed writing to the temp file: %v", err)
 	}
 	return outFile.Name(), nil