diff --git a/texttospeech/package.json b/texttospeech/package.json
index ee964dfafc..3e22ab1b40 100644
--- a/texttospeech/package.json
+++ b/texttospeech/package.json
@@ -19,7 +19,6 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "execa": "^1.0.0",
     "mocha": "^6.0.0"
   },
   "optionalDependencies": {
diff --git a/texttospeech/test/audioProfile.test.js b/texttospeech/test/audioProfile.test.js
index e96bf8e061..1219b851b6 100644
--- a/texttospeech/test/audioProfile.test.js
+++ b/texttospeech/test/audioProfile.test.js
@@ -17,14 +17,9 @@
 
 const fs = require('fs');
 const {assert} = require('chai');
-const execa = require('execa');
+const {execSync} = require('child_process');
 
 const cmd = 'node audioProfile.js';
-const exec = async cmd => {
-  const res = await execa.shell(cmd);
-  assert.isEmpty(res.stderr);
-  return res.stdout;
-};
 const text = 'Hello Everybody!  This is an Audio Profile Optimized Sound Byte.';
 const outputFile1 = 'phonetest.mp3';
 const outputFile2 = 'homeTheatreTest.mp3';
@@ -45,7 +40,7 @@ describe('audio profile', () => {
 
   it('should synthesize Speech for Telephone Audio Profile', async () => {
     assert.strictEqual(fs.existsSync(outputFile1), false);
-    const output = await exec(
+    const output = execSync(
       `${cmd} synthesize '${text}' -f ${outputFile1} -e telephony-class-application`
     );
     assert.match(
@@ -57,7 +52,7 @@ describe('audio profile', () => {
 
   it('should synthesize Speech for Home Theatre Audio Profile', async () => {
     assert.strictEqual(fs.existsSync(outputFile2), false);
-    const output = await exec(
+    const output = execSync(
       `${cmd} synthesize '${text}' -f ${outputFile2} -e large-home-entertainment-class-device`
     );
     assert.match(
@@ -69,7 +64,7 @@ describe('audio profile', () => {
 
   it('should synthesize Speech for Car Audio Audio Profile', async () => {
     assert.strictEqual(fs.existsSync(outputFile3), false);
-    const output = await exec(
+    const output = execSync(
       `${cmd} synthesize '${text}' -f ${outputFile3} -e large-automotive-class-device`
     );
     assert.match(
@@ -81,7 +76,7 @@ describe('audio profile', () => {
 
   it('should synthesize Speech for Watch Audio Profile', async () => {
     assert.strictEqual(fs.existsSync(outputFile4), false);
-    const output = await exec(
+    const output = execSync(
       `${cmd} synthesize '${text}' -f ${outputFile4} -e wearable-class-device`
     );
     assert.match(
diff --git a/texttospeech/test/listVoices.test.js b/texttospeech/test/listVoices.test.js
index 80b46da6b1..c35bd671eb 100644
--- a/texttospeech/test/listVoices.test.js
+++ b/texttospeech/test/listVoices.test.js
@@ -16,13 +16,13 @@
 'use strict';
 
 const {assert} = require('chai');
-const execa = require('execa');
+const {execSync} = require('child_process');
 
 const cmd = 'node listVoices.js';
 
 describe('list voices', () => {
   it('should list voices', async () => {
-    const {stdout} = await execa.shell(`${cmd} list-voices`);
+    const stdout = execSync(`${cmd} list-voices`);
     assert.match(stdout, /SSML Voice Gender: FEMALE/);
     assert.match(stdout, /Natural Sample Rate Hertz: 24000/);
   });
diff --git a/texttospeech/test/quickstart.test.js b/texttospeech/test/quickstart.test.js
index 09bf7c22ac..946f908c2e 100644
--- a/texttospeech/test/quickstart.test.js
+++ b/texttospeech/test/quickstart.test.js
@@ -17,7 +17,7 @@
 
 const fs = require('fs');
 const {assert} = require('chai');
-const execa = require('execa');
+const {execSync} = require('child_process');
 
 const outputFile = 'output.mp3';
 
@@ -32,7 +32,7 @@ describe('quickstart', () => {
 
   it('should synthesize speech to local mp3 file', async () => {
     assert.strictEqual(fs.existsSync(outputFile), false);
-    const {stdout} = await execa.shell('node quickstart');
+    const stdout = execSync('node quickstart');
     assert.match(stdout, /Audio content written to file: output.mp3/);
     assert.ok(fs.existsSync(outputFile));
   });
diff --git a/texttospeech/test/synthesize.test.js b/texttospeech/test/synthesize.test.js
index 34e2c9538f..45b7500918 100644
--- a/texttospeech/test/synthesize.test.js
+++ b/texttospeech/test/synthesize.test.js
@@ -18,13 +18,8 @@
 const fs = require('fs');
 const path = require('path');
 const {assert} = require('chai');
-const execa = require('execa');
+const {execSync} = require('child_process');
 
-const exec = async cmd => {
-  const res = await execa.shell(cmd);
-  assert.isEmpty(res.stderr);
-  return res.stdout;
-};
 const cmd = 'node synthesize.js';
 const text = 'Hello there.';
 const ssml = '<speak>Hello there.</speak>';
@@ -47,9 +42,7 @@ describe('synthesize', () => {
 
   it('should synthesize audio from text', async () => {
     assert.strictEqual(fs.existsSync(outputFile), false);
-    const output = await exec(
-      `${cmd} text '${text}' --outputFile ${outputFile}`
-    );
+    const output = execSync(`${cmd} text '${text}' --outputFile ${outputFile}`);
     assert.match(
       output,
       new RegExp(`Audio content written to file: ${outputFile}`)
@@ -59,9 +52,7 @@ describe('synthesize', () => {
 
   it('should synthesize audio from ssml', async () => {
     assert.strictEqual(fs.existsSync(outputFile), false);
-    const output = await exec(
-      `${cmd} ssml "${ssml}" --outputFile ${outputFile}`
-    );
+    const output = execSync(`${cmd} ssml "${ssml}" --outputFile ${outputFile}`);
     assert.match(
       output,
       new RegExp(`Audio content written to file: ${outputFile}`)
@@ -71,7 +62,7 @@ describe('synthesize', () => {
 
   it('should synthesize audio from text file', async () => {
     assert.strictEqual(fs.existsSync(outputFile), false);
-    const output = await exec(
+    const output = execSync(
       `${cmd} text-file ${files[0].localPath} --outputFile ${outputFile}`
     );
     assert.match(
@@ -83,7 +74,7 @@ describe('synthesize', () => {
 
   it('should synthesize audio from ssml file', async () => {
     assert.strictEqual(fs.existsSync(outputFile), false);
-    const output = await exec(
+    const output = execSync(
       `${cmd} ssml-file ${files[1].localPath} --outputFile ${outputFile}`
     );
     assert.match(