diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9515999b1..87360d3ba 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,7 +4,7 @@ on:
   pull_request:
   push:
     branches:
-      - master
+      - main
       - releases/*
 
 jobs:
diff --git a/README.md b/README.md
index c2bd06945..7d872bec8 100644
--- a/README.md
+++ b/README.md
@@ -204,7 +204,7 @@ Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous
 ```yaml
 on:
   pull_request:
-    branches: [master]
+    branches: [main]
     types: [opened, synchronize, closed]
 jobs:
   build:
diff --git a/__test__/git-auth-helper.test.ts b/__test__/git-auth-helper.test.ts
index e4e640c62..2b4830cc8 100644
--- a/__test__/git-auth-helper.test.ts
+++ b/__test__/git-auth-helper.test.ts
@@ -764,7 +764,7 @@ async function setup(testName: string): Promise<void> {
     submodules: false,
     nestedSubmodules: false,
     persistCredentials: true,
-    ref: 'refs/heads/master',
+    ref: 'refs/heads/main',
     repositoryName: 'my-repo',
     repositoryOwner: 'my-org',
     repositoryPath: '',
diff --git a/__test__/verify-basic.sh b/__test__/verify-basic.sh
index aedd66d8f..5aaa309b8 100755
--- a/__test__/verify-basic.sh
+++ b/__test__/verify-basic.sh
@@ -20,5 +20,5 @@ else
 
   # Verify auth token
   cd basic
-  git fetch --no-tags --depth=1 origin +refs/heads/master:refs/remotes/origin/master
+  git fetch --no-tags --depth=1 origin +refs/heads/main:refs/remotes/origin/main
 fi
diff --git a/adrs/0153-checkout-v2.md b/adrs/0153-checkout-v2.md
index f174b1a2d..74730c735 100644
--- a/adrs/0153-checkout-v2.md
+++ b/adrs/0153-checkout-v2.md
@@ -24,7 +24,7 @@ We want to take this opportunity to make behavioral changes, from v1. This docum
     description: >
       The branch, tag or SHA to checkout. When checking out the repository that
       triggered a workflow, this defaults to the reference or SHA for that
-      event.  Otherwise, defaults to `master`.
+      event.  Otherwise, uses the default branch.
   token:
     description: >
       Personal access token (PAT) used to fetch the repository. The PAT is configured
@@ -277,7 +277,7 @@ Note:
 ### Branching strategy and release tags
 
 - Create a servicing branch for V1: `releases/v1`
-- Merge the changes into `master`
+- Merge the changes into the default branch
 - Release using a new tag `preview`
 - When stable, release using a new tag `v2`
 
diff --git a/dist/index.js b/dist/index.js
index e0d023855..ae64f3fe9 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -5900,7 +5900,7 @@ class GitCommandManager {
     /**
      * Resolves a ref to a SHA. For a branch or lightweight tag, the commit SHA is returned.
      * For an annotated tag, the tag SHA is returned.
-     * @param {string} ref  For example: 'refs/heads/master' or '/refs/tags/v1'
+     * @param {string} ref  For example: 'refs/heads/main' or '/refs/tags/v1'
      * @returns {Promise<string>}
      */
     revParse(ref) {
@@ -14545,7 +14545,7 @@ function getInputs() {
             result.ref = github.context.ref;
             result.commit = github.context.sha;
             // Some events have an unqualifed ref. For example when a PR is merged (pull_request closed event),
-            // the ref is unqualifed like "master" instead of "refs/heads/master".
+            // the ref is unqualifed like "main" instead of "refs/heads/main".
             if (result.commit && result.ref && !result.ref.startsWith('refs/')) {
                 result.ref = `refs/heads/${result.ref}`;
             }
diff --git a/src/git-command-manager.ts b/src/git-command-manager.ts
index 8bf3aa16b..059e3d8ac 100644
--- a/src/git-command-manager.ts
+++ b/src/git-command-manager.ts
@@ -270,7 +270,7 @@ class GitCommandManager {
   /**
    * Resolves a ref to a SHA. For a branch or lightweight tag, the commit SHA is returned.
    * For an annotated tag, the tag SHA is returned.
-   * @param {string} ref  For example: 'refs/heads/master' or '/refs/tags/v1'
+   * @param {string} ref  For example: 'refs/heads/main' or '/refs/tags/v1'
    * @returns {Promise<string>}
    */
   async revParse(ref: string): Promise<string> {
diff --git a/src/input-helper.ts b/src/input-helper.ts
index eabb9e0fe..4c05d6e32 100644
--- a/src/input-helper.ts
+++ b/src/input-helper.ts
@@ -63,7 +63,7 @@ export function getInputs(): IGitSourceSettings {
       result.commit = github.context.sha
 
       // Some events have an unqualifed ref. For example when a PR is merged (pull_request closed event),
-      // the ref is unqualifed like "master" instead of "refs/heads/master".
+      // the ref is unqualifed like "main" instead of "refs/heads/main".
       if (result.commit && result.ref && !result.ref.startsWith('refs/')) {
         result.ref = `refs/heads/${result.ref}`
       }