diff --git a/packages/google-cloud-texttospeech/README.md b/packages/google-cloud-texttospeech/README.md
index 87f7dae8221..f076b1b3b07 100644
--- a/packages/google-cloud-texttospeech/README.md
+++ b/packages/google-cloud-texttospeech/README.md
@@ -6,7 +6,7 @@
 
 [![release level](https://img.shields.io/badge/release%20level-general%20availability%20%28GA%29-brightgreen.svg?style=flat)](https://cloud.google.com/terms/launch-stages)
 [![npm version](https://img.shields.io/npm/v/@google-cloud/text-to-speech.svg)](https://www.npmjs.org/package/@google-cloud/text-to-speech)
-[![codecov](https://img.shields.io/codecov/c/github/googleapis/nodejs-text-to-speech/master.svg?style=flat)](https://codecov.io/gh/googleapis/nodejs-text-to-speech)
+[![codecov](https://img.shields.io/codecov/c/github/googleapis/nodejs-text-to-speech/main.svg?style=flat)](https://codecov.io/gh/googleapis/nodejs-text-to-speech)
 
 
 
@@ -15,7 +15,7 @@ Cloud Text-to-Speech API client for Node.js
 
 
 A comprehensive list of changes in each version may be found in
-[the CHANGELOG](https://github.com/googleapis/nodejs-text-to-speech/blob/master/CHANGELOG.md).
+[the CHANGELOG](https://github.com/googleapis/nodejs-text-to-speech/blob/main/CHANGELOG.md).
 
 * [Google Cloud Text-to-Speech Node.js Client API Reference][client-docs]
 * [Google Cloud Text-to-Speech Documentation][product-docs]
@@ -94,15 +94,15 @@ quickStart();
 
 ## Samples
 
-Samples are in the [`samples/`](https://github.com/googleapis/nodejs-text-to-speech/tree/master/samples) directory. Each sample's `README.md` has instructions for running its sample.
+Samples are in the [`samples/`](https://github.com/googleapis/nodejs-text-to-speech/tree/main/samples) directory. Each sample's `README.md` has instructions for running its sample.
 
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |
-| Audio Profile | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/audioProfile.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/audioProfile.js,samples/README.md) |
-| List Voices | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/listVoices.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/listVoices.js,samples/README.md) |
-| Quickstart | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/quickstart.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/quickstart.js,samples/README.md) |
-| Ssml Addresses | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/ssmlAddresses.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/ssmlAddresses.js,samples/README.md) |
-| Synthesize | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/synthesize.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/synthesize.js,samples/README.md) |
+| Audio Profile | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/audioProfile.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/audioProfile.js,samples/README.md) |
+| List Voices | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/listVoices.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/listVoices.js,samples/README.md) |
+| Quickstart | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/quickstart.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/quickstart.js,samples/README.md) |
+| Ssml Addresses | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/ssmlAddresses.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/ssmlAddresses.js,samples/README.md) |
+| Synthesize | [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/synthesize.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/synthesize.js,samples/README.md) |
 
 
 
@@ -151,7 +151,7 @@ More Information: [Google Cloud Platform Launch Stages][launch_stages]
 
 ## Contributing
 
-Contributions welcome! See the [Contributing Guide](https://github.com/googleapis/nodejs-text-to-speech/blob/master/CONTRIBUTING.md).
+Contributions welcome! See the [Contributing Guide](https://github.com/googleapis/nodejs-text-to-speech/blob/main/CONTRIBUTING.md).
 
 Please note that this `README.md`, the `samples/README.md`,
 and a variety of configuration files in this repository (including `.nycrc` and `tsconfig.json`)
@@ -163,7 +163,7 @@ to its templates in
 
 Apache Version 2.0
 
-See [LICENSE](https://github.com/googleapis/nodejs-text-to-speech/blob/master/LICENSE)
+See [LICENSE](https://github.com/googleapis/nodejs-text-to-speech/blob/main/LICENSE)
 
 [client-docs]: https://googleapis.dev/nodejs/text-to-speech/latest
 [product-docs]: https://cloud.google.com/text-to-speech
diff --git a/packages/google-cloud-texttospeech/samples/README.md b/packages/google-cloud-texttospeech/samples/README.md
index 3ef0c333f98..077213b334f 100644
--- a/packages/google-cloud-texttospeech/samples/README.md
+++ b/packages/google-cloud-texttospeech/samples/README.md
@@ -35,7 +35,7 @@ Before running the samples, make sure you've followed the steps outlined in
 
 ### Audio Profile
 
-View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/audioProfile.js).
+View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/audioProfile.js).
 
 [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/audioProfile.js,samples/README.md)
 
@@ -52,7 +52,7 @@ __Usage:__
 
 ### List Voices
 
-View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/listVoices.js).
+View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/listVoices.js).
 
 [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/listVoices.js,samples/README.md)
 
@@ -69,7 +69,7 @@ __Usage:__
 
 ### Quickstart
 
-View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/quickstart.js).
+View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/quickstart.js).
 
 [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/quickstart.js,samples/README.md)
 
@@ -86,7 +86,7 @@ __Usage:__
 
 ### Ssml Addresses
 
-View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/ssmlAddresses.js).
+View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/ssmlAddresses.js).
 
 [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/ssmlAddresses.js,samples/README.md)
 
@@ -103,7 +103,7 @@ __Usage:__
 
 ### Synthesize
 
-View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/master/samples/synthesize.js).
+View the [source code](https://github.com/googleapis/nodejs-text-to-speech/blob/main/samples/synthesize.js).
 
 [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/nodejs-text-to-speech&page=editor&open_in_editor=samples/synthesize.js,samples/README.md)