diff --git a/.github/workflows/artifact-tests.yml b/.github/workflows/artifact-tests.yml
index 7125ca9f..ef9a17d1 100644
--- a/.github/workflows/artifact-tests.yml
+++ b/.github/workflows/artifact-tests.yml
@@ -2,7 +2,7 @@ name: artifact-unit-tests
 on:
   push:
     branches:
-      - master
+      - main
     paths-ignore:
       - '**.md'
   pull_request:
diff --git a/.github/workflows/audit.yml b/.github/workflows/audit.yml
index 669b4b49..6c9f1124 100644
--- a/.github/workflows/audit.yml
+++ b/.github/workflows/audit.yml
@@ -2,7 +2,7 @@ name: toolkit-audit
 on:
   push:
     branches:
-      - master
+      - main
     paths-ignore:
       - '**.md'
   pull_request:
diff --git a/.github/workflows/cache-tests.yml b/.github/workflows/cache-tests.yml
index a2daa7eb..dab446bb 100644
--- a/.github/workflows/cache-tests.yml
+++ b/.github/workflows/cache-tests.yml
@@ -2,7 +2,7 @@ name: cache-unit-tests
 on:
   push:
     branches:
-      - master
+      - main
     paths-ignore:
       - '**.md'
   pull_request:
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index efe5c435..f5bcb340 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -2,7 +2,7 @@ name: toolkit-unit-tests
 on:
   push:
     branches:
-      - master
+      - main
     paths-ignore:
       - '**.md'
   pull_request:
diff --git a/.github/workflows/update-github.yaml b/.github/workflows/update-github.yaml
index 2d6b0280..f41e254e 100644
--- a/.github/workflows/update-github.yaml
+++ b/.github/workflows/update-github.yaml
@@ -37,7 +37,7 @@ jobs:
           script: |
             github.pulls.create(
             {
-              base: "master",
+              base: "main",
               owner: "${{github.repository_owner}}",
               repo: "toolkit",
               title: "Update Octokit dependencies",
diff --git a/docs/action-types.md b/docs/action-types.md
index f0926d15..56310931 100644
--- a/docs/action-types.md
+++ b/docs/action-types.md
@@ -32,14 +32,14 @@ jobs:
         os: [ubuntu-16.04, windows-2019]
     runs-on: ${{matrix.os}}
     actions:
-    - uses: actions/setup-node@master
+    - uses: actions/setup-node@v1
       with:
         version: ${{matrix.node}}
     - run: | 
         npm install
     - run: |
         npm test
-    - uses: actions/custom-action@master
+    - uses: actions/custom-action@v1
 ```
 
 JavaScript actions work on any environment that host action runtime is supported on which is currently node 12.  However, a host action that runs a toolset expects the environment that it's running on to have that toolset in its PATH or using a setup-* action to acquire it on demand.
diff --git a/docs/action-versioning.md b/docs/action-versioning.md
index 4a8e8168..b1847424 100644
--- a/docs/action-versioning.md
+++ b/docs/action-versioning.md
@@ -17,13 +17,13 @@ Binding to a major version is the latest of that major version ( e.g. `v1` == "1
 
 Major versions should guarantee compatibility.  A major version can add net new capabilities but should not break existing input compatibility or break existing workflows. 
 
-Major version binding allows you to take advantage of bug fixes and critical functionality and security fixes.  The `master` branch has the latest code and is unstable to bind to since changes get committed to master and released to the market place by creating a tag.  In addition, a new major version carrying breaking changes will get implemented in master after branching off the previous major version.
+Major version binding allows you to take advantage of bug fixes and critical functionality and security fixes.  The `main` branch has the latest code and is unstable to bind to since changes get committed to main and released to the market place by creating a tag.  In addition, a new major version carrying breaking changes will get implemented in main after branching off the previous major version.
 
-> Warning: do not reference `master` since that is the latest code and can be carrying breaking changes of the next major version.
+> Warning: do not reference `main` since that is the latest code and can be carrying breaking changes of the next major version.
 
 ```yaml
 steps:
-    - uses: actions/javascript-action@master  # do not do this
+    - uses: actions/javascript-action@main  # do not do this
 ```
 
 Binding to the immutable full sha1 may offer more reliability.  However, note that the hosted images toolsets (e.g. ubuntu-latest) move forward and if there is a tool breaking issue, actions may react with a patch to a major version to compensate so binding to a specific SHA may prevent you from getting fixes.
diff --git a/docs/commands.md b/docs/commands.md
index 0edf2f07..30d58d94 100644
--- a/docs/commands.md
+++ b/docs/commands.md
@@ -1,6 +1,6 @@
 # :: Commands
 
-The [core toolkit package](https://github.com/actions/toolkit/tree/master/packages/core) offers a number of convenience functions for
+The [core toolkit package](https://github.com/actions/toolkit/tree/main/packages/core) offers a number of convenience functions for
 setting results, logging, registering secrets and exporting variables across actions. Sometimes, however, its useful to be able to do
 these things in a script or other tool.
 
diff --git a/docs/container-action.md b/docs/container-action.md
index 05cc934d..4c1adf2b 100644
--- a/docs/container-action.md
+++ b/docs/container-action.md
@@ -18,7 +18,7 @@ e.g. To use https://github.com/actions/setup-node, users will author:
 
 ```yaml
 steps:
-    using: actions/setup-node@master
+    using: actions/setup-node@v1
 ```
 
 # Define Metadata
diff --git a/docs/problem-matchers.md b/docs/problem-matchers.md
index f8867849..50bcd1e1 100644
--- a/docs/problem-matchers.md
+++ b/docs/problem-matchers.md
@@ -111,10 +111,10 @@ Registering two problem-matchers with the same owner will result in only the pro
 ## Examples
 
 Some of the starter actions are already using problem matchers, for example:
-- [setup-node](https://github.com/actions/setup-node/tree/master/.github)
-- [setup-python](https://github.com/actions/setup-python/tree/master/.github)
-- [setup-go](https://github.com/actions/setup-go/tree/master/.github)
-- [setup-dotnet](https://github.com/actions/setup-dotnet/tree/master/.github)
+- [setup-node](https://github.com/actions/setup-node/tree/main/.github)
+- [setup-python](https://github.com/actions/setup-python/tree/main/.github)
+- [setup-go](https://github.com/actions/setup-go/tree/main/.github)
+- [setup-dotnet](https://github.com/actions/setup-dotnet/tree/main/.github)
 
 ## Troubleshooting
 
diff --git a/packages/artifact/README.md b/packages/artifact/README.md
index 197f80a5..ac67b5cd 100644
--- a/packages/artifact/README.md
+++ b/packages/artifact/README.md
@@ -203,6 +203,6 @@ Check out [implementation-details](docs/implementation-details.md) for extra inf
 
 ## Contributions
 
-See [contributor guidelines](https://github.com/actions/toolkit/blob/master/.github/CONTRIBUTING.md) for general guidelines and information about toolkit contributions.
+See [contributor guidelines](https://github.com/actions/toolkit/blob/main/.github/CONTRIBUTING.md) for general guidelines and information about toolkit contributions.
 
 For contributions related to this package, see [artifact contributions](CONTRIBUTIONS.md) for more information.
diff --git a/packages/artifact/package.json b/packages/artifact/package.json
index 42891a15..926786c3 100644
--- a/packages/artifact/package.json
+++ b/packages/artifact/package.json
@@ -8,7 +8,7 @@
     "actions",
     "artifact"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/artifact",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/artifact",
   "license": "MIT",
   "main": "lib/artifact-client.js",
   "types": "lib/artifact-client.d.ts",
diff --git a/packages/cache/__tests__/restoreCache.test.ts b/packages/cache/__tests__/restoreCache.test.ts
index c8a52ea4..5095947c 100644
--- a/packages/cache/__tests__/restoreCache.test.ts
+++ b/packages/cache/__tests__/restoreCache.test.ts
@@ -104,7 +104,7 @@ test('restore with gzip compressed cache found', async () => {
 
   const cacheEntry: ArtifactCacheEntry = {
     cacheKey: key,
-    scope: 'refs/heads/master',
+    scope: 'refs/heads/main',
     archiveLocation: 'www.actionscache.test/download'
   }
   const getCacheMock = jest.spyOn(cacheHttpClient, 'getCacheEntry')
@@ -166,7 +166,7 @@ test('restore with zstd compressed cache found', async () => {
 
   const cacheEntry: ArtifactCacheEntry = {
     cacheKey: key,
-    scope: 'refs/heads/master',
+    scope: 'refs/heads/main',
     archiveLocation: 'www.actionscache.test/download'
   }
   const getCacheMock = jest.spyOn(cacheHttpClient, 'getCacheEntry')
@@ -223,7 +223,7 @@ test('restore with cache found for restore key', async () => {
 
   const cacheEntry: ArtifactCacheEntry = {
     cacheKey: restoreKey,
-    scope: 'refs/heads/master',
+    scope: 'refs/heads/main',
     archiveLocation: 'www.actionscache.test/download'
   }
   const getCacheMock = jest.spyOn(cacheHttpClient, 'getCacheEntry')
diff --git a/packages/cache/package.json b/packages/cache/package.json
index 630229da..c41de866 100644
--- a/packages/cache/package.json
+++ b/packages/cache/package.json
@@ -8,7 +8,7 @@
     "actions",
     "cache"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/cache",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/cache",
   "license": "MIT",
   "main": "lib/cache.js",
   "types": "lib/cache.d.ts",
diff --git a/packages/cache/src/internal/cacheUtils.ts b/packages/cache/src/internal/cacheUtils.ts
index 0628ffa4..bdcef88d 100644
--- a/packages/cache/src/internal/cacheUtils.ts
+++ b/packages/cache/src/internal/cacheUtils.ts
@@ -9,7 +9,7 @@ import * as util from 'util'
 import {v4 as uuidV4} from 'uuid'
 import {CacheFilename, CompressionMethod} from './constants'
 
-// From https://github.com/actions/toolkit/blob/master/packages/tool-cache/src/tool-cache.ts#L23
+// From https://github.com/actions/toolkit/blob/main/packages/tool-cache/src/tool-cache.ts#L23
 export async function createTempDirectory(): Promise<string> {
   const IS_WINDOWS = process.platform === 'win32'
 
diff --git a/packages/core/package.json b/packages/core/package.json
index 05f03cb9..f45b48b6 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -7,7 +7,7 @@
     "actions",
     "core"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/core",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/core",
   "license": "MIT",
   "main": "lib/core.js",
   "types": "lib/core.d.ts",
diff --git a/packages/exec/package.json b/packages/exec/package.json
index fde021d3..d800aa46 100644
--- a/packages/exec/package.json
+++ b/packages/exec/package.json
@@ -7,7 +7,7 @@
     "actions",
     "exec"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/exec",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/exec",
   "license": "MIT",
   "main": "lib/exec.js",
   "types": "lib/exec.d.ts",
diff --git a/packages/github/__tests__/github.proxy.test.ts b/packages/github/__tests__/github.proxy.test.ts
index 5da06582..1dd38387 100644
--- a/packages/github/__tests__/github.proxy.test.ts
+++ b/packages/github/__tests__/github.proxy.test.ts
@@ -52,9 +52,9 @@ describe('@actions/github', () => {
     const branch = await octokit.repos.getBranch({
       owner: 'actions',
       repo: 'toolkit',
-      branch: 'master'
+      branch: 'main'
     })
-    expect(branch.data.name).toBe('master')
+    expect(branch.data.name).toBe('main')
     expect(proxyConnects).toEqual(['api.github.com:443'])
   })
 
@@ -88,9 +88,9 @@ describe('@actions/github', () => {
     const branch = await octokit.repos.getBranch({
       owner: 'actions',
       repo: 'toolkit',
-      branch: 'master'
+      branch: 'main'
     })
-    expect(branch.data.name).toBe('master')
+    expect(branch.data.name).toBe('main')
     expect(proxyConnects).toHaveLength(0)
   })
 
diff --git a/packages/github/__tests__/github.test.ts b/packages/github/__tests__/github.test.ts
index 4e02c7b3..b4abfc4c 100644
--- a/packages/github/__tests__/github.test.ts
+++ b/packages/github/__tests__/github.test.ts
@@ -48,9 +48,9 @@ describe('@actions/github', () => {
     const branch = await octokit.repos.getBranch({
       owner: 'actions',
       repo: 'toolkit',
-      branch: 'master'
+      branch: 'main'
     })
-    expect(branch.data.name).toBe('master')
+    expect(branch.data.name).toBe('main')
     expect(proxyConnects).toHaveLength(0)
   })
 
@@ -63,9 +63,9 @@ describe('@actions/github', () => {
     const branch = await octokit.repos.getBranch({
       owner: 'actions',
       repo: 'toolkit',
-      branch: 'master'
+      branch: 'main'
     })
-    expect(branch.data.name).toBe('master')
+    expect(branch.data.name).toBe('main')
     expect(proxyConnects).toHaveLength(0)
   })
 
@@ -80,9 +80,9 @@ describe('@actions/github', () => {
     const branch = await octokit.repos.getBranch({
       owner: 'actions',
       repo: 'toolkit',
-      branch: 'master'
+      branch: 'main'
     })
-    expect(branch.data.name).toBe('master')
+    expect(branch.data.name).toBe('main')
     expect(proxyConnects).toHaveLength(0)
 
     // Invalid token
@@ -92,7 +92,7 @@ describe('@actions/github', () => {
       await octokit.repos.getBranch({
         owner: 'actions',
         repo: 'toolkit',
-        branch: 'master'
+        branch: 'main'
       })
     } catch (err) {
       failed = true
diff --git a/packages/github/package.json b/packages/github/package.json
index c7f89931..96803f39 100644
--- a/packages/github/package.json
+++ b/packages/github/package.json
@@ -6,7 +6,7 @@
     "github",
     "actions"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/github",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/github",
   "license": "MIT",
   "main": "lib/github.js",
   "types": "lib/github.d.ts",
diff --git a/packages/github/src/context.ts b/packages/github/src/context.ts
index 52efabb0..4eb70543 100644
--- a/packages/github/src/context.ts
+++ b/packages/github/src/context.ts
@@ -1,4 +1,4 @@
-// Originally pulled from https://github.com/JasonEtco/actions-toolkit/blob/master/src/context.ts
+// Originally pulled from https://github.com/JasonEtco/actions-toolkit/blob/main/src/context.ts
 import {WebhookPayload} from './interfaces'
 import {readFileSync, existsSync} from 'fs'
 import {EOL} from 'os'
diff --git a/packages/glob/package.json b/packages/glob/package.json
index e75dae1c..bafb0d40 100644
--- a/packages/glob/package.json
+++ b/packages/glob/package.json
@@ -8,7 +8,7 @@
     "actions",
     "glob"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/glob",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/glob",
   "license": "MIT",
   "main": "lib/glob.js",
   "types": "lib/glob.d.ts",
diff --git a/packages/io/package.json b/packages/io/package.json
index 9d4213e1..9ef283f8 100644
--- a/packages/io/package.json
+++ b/packages/io/package.json
@@ -7,7 +7,7 @@
     "actions",
     "io"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/io",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/io",
   "license": "MIT",
   "main": "lib/io.js",
   "types": "lib/io.d.ts",
diff --git a/packages/tool-cache/__tests__/manifest.test.ts b/packages/tool-cache/__tests__/manifest.test.ts
index 1c93b627..51707694 100644
--- a/packages/tool-cache/__tests__/manifest.test.ts
+++ b/packages/tool-cache/__tests__/manifest.test.ts
@@ -8,7 +8,7 @@ import osm = require('os')
 import cp = require('child_process')
 //import {coerce} from 'semver'
 
-// we fetch the manifest file from master of a repo
+// we fetch the manifest file from main of a repo
 const owner = 'actions'
 const repo = 'some-tool'
 const fakeToken = 'notrealtoken'
diff --git a/packages/tool-cache/package.json b/packages/tool-cache/package.json
index 2a6cca2f..4ff76d32 100644
--- a/packages/tool-cache/package.json
+++ b/packages/tool-cache/package.json
@@ -7,7 +7,7 @@
     "actions",
     "exec"
   ],
-  "homepage": "https://github.com/actions/toolkit/tree/master/packages/tool-cache",
+  "homepage": "https://github.com/actions/toolkit/tree/main/packages/tool-cache",
   "license": "MIT",
   "main": "lib/tool-cache.js",
   "types": "lib/tool-cache.d.ts",