diff --git a/packages/google-cloud-speech/package.json b/packages/google-cloud-speech/package.json
index 46ab8bb0cdd..b4767c7dca1 100644
--- a/packages/google-cloud-speech/package.json
+++ b/packages/google-cloud-speech/package.json
@@ -72,7 +72,7 @@
     "prettier": "^1.13.5",
     "sinon": "^7.0.0",
     "ts-loader": "^6.2.1",
-    "typescript": "~3.7.0",
+    "typescript": "3.6.4",
     "webpack": "^4.41.2",
     "webpack-cli": "^3.3.10"
   }
diff --git a/packages/google-cloud-speech/system-test/speech_typescript_system_test.ts b/packages/google-cloud-speech/system-test/speech_typescript_system_test.ts
index 21e8c9203c6..5309d646a04 100644
--- a/packages/google-cloud-speech/system-test/speech_typescript_system_test.ts
+++ b/packages/google-cloud-speech/system-test/speech_typescript_system_test.ts
@@ -41,7 +41,7 @@ describe('SpeechClient TypeScript system test default', () => {
     };
     const [response] = await client.recognize(request);
     assert.strictEqual(
-      response?.results?.[0]?.alternatives?.[0]?.transcript,
+      response.results![0].alternatives![0].transcript,
       'hello'
     );
   });
@@ -69,7 +69,7 @@ describe('SpeechClient TypeScript system test default', () => {
     const [operation] = await client.longRunningRecognize(request);
     const [response] = await operation.promise();
     assert.strictEqual(
-      response?.results?.[0]?.alternatives?.[0]?.transcript,
+      response.results![0].alternatives![0].transcript,
       'hello'
     );
   });
@@ -103,7 +103,7 @@ describe('SpeechClient TypeScript system test default', () => {
       'data',
       (response: google.cloud.speech.v1.IStreamingRecognizeResponse) => {
         assert.strictEqual(
-          response?.results?.[0]?.alternatives?.[0]?.transcript,
+          response.results![0].alternatives![0].transcript,
           'test of streaming recognize call'
         );
         gotResponse = true;
diff --git a/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1.ts b/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1.ts
index dedc762d054..024728e4e08 100644
--- a/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1.ts
+++ b/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1.ts
@@ -41,7 +41,7 @@ describe('SpeechClient TypeScript system test v1', () => {
     };
     const [response] = await client.recognize(request);
     assert.strictEqual(
-      response?.results?.[0]?.alternatives?.[0]?.transcript,
+      response.results![0]!.alternatives![0].transcript,
       'hello'
     );
   });
@@ -69,7 +69,7 @@ describe('SpeechClient TypeScript system test v1', () => {
     const [operation] = await client.longRunningRecognize(request);
     const [response] = await operation.promise();
     assert.strictEqual(
-      response?.results?.[0]?.alternatives?.[0]?.transcript,
+      response.results![0].alternatives![0].transcript,
       'hello'
     );
   });
@@ -103,7 +103,7 @@ describe('SpeechClient TypeScript system test v1', () => {
       'data',
       (response: google.cloud.speech.v1.IStreamingRecognizeResponse) => {
         assert.strictEqual(
-          response?.results?.[0]?.alternatives?.[0]?.transcript,
+          response.results![0].alternatives![0].transcript,
           'test of streaming recognize call'
         );
         gotResponse = true;
diff --git a/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1p1beta1.ts b/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1p1beta1.ts
index 9bf94da77b5..210b4537eb7 100644
--- a/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1p1beta1.ts
+++ b/packages/google-cloud-speech/system-test/speech_typescript_system_test_v1p1beta1.ts
@@ -41,7 +41,7 @@ describe('SpeechClient TypeScript system test v1p1beta1', () => {
     };
     const [response] = await client.recognize(request);
     assert.strictEqual(
-      response?.results?.[0]?.alternatives?.[0]?.transcript,
+      response.results![0].alternatives![0].transcript,
       'hello'
     );
   });
@@ -69,7 +69,7 @@ describe('SpeechClient TypeScript system test v1p1beta1', () => {
     const [operation] = await client.longRunningRecognize(request);
     const [response] = await operation.promise();
     assert.strictEqual(
-      response?.results?.[0]?.alternatives?.[0]?.transcript,
+      response.results![0].alternatives![0].transcript,
       'hello'
     );
   });
@@ -103,7 +103,7 @@ describe('SpeechClient TypeScript system test v1p1beta1', () => {
       'data',
       (response: google.cloud.speech.v1p1beta1.IStreamingRecognizeResponse) => {
         assert.strictEqual(
-          response?.results?.[0]?.alternatives?.[0]?.transcript,
+          response.results![0].alternatives![0].transcript,
           'test of streaming recognize call'
         );
         gotResponse = true;