diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e208b6e5..b483868b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
   schedule:
     # Run daily (* needs quotes).
     - cron: '0 4 * * *'
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 34951e30..511214f3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -62,8 +62,8 @@ To install `tox`, run:
 ### Creating a new branch
 
 To start working on a pull request, create a new branch to work on. You
-should never develop on your master branch because your master branch
-should always be synchronized with the main repo’s master branch, which
+should never develop on your main branch because your main branch
+should always be synchronized with the main repo’s main branch, which
 is challenging if it has new commits. Create a branch using:
 
     $ git checkout -b your-new-branch
diff --git a/README.md b/README.md
index 6d70760e..56e8c5fe 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Vulture - Find dead code
 
 ![CI:Test](https://github.com/jendrikseipp/vulture/workflows/CI/badge.svg)
-[![Codecov Badge](https://codecov.io/gh/jendrikseipp/vulture/branch/master/graphs/badge.svg)](https://codecov.io/gh/jendrikseipp/vulture?branch=master)
+[![Codecov Badge](https://codecov.io/gh/jendrikseipp/vulture/branch/main/graphs/badge.svg)](https://codecov.io/gh/jendrikseipp/vulture?branch=main)
 
 Vulture finds unused code in Python programs. This is useful for
 cleaning up and finding errors in large code bases. If you run Vulture
@@ -327,8 +327,8 @@ Please visit <https://github.com/jendrikseipp/vulture> to report any
 issues or to make pull requests.
 
   - Contributing guide:
-    [CONTRIBUTING.md](https://github.com/jendrikseipp/vulture/blob/master/CONTRIBUTING.md)
+    [CONTRIBUTING.md](https://github.com/jendrikseipp/vulture/blob/main/CONTRIBUTING.md)
   - Release notes:
-    [CHANGELOG.md](https://github.com/jendrikseipp/vulture/blob/master/CHANGELOG.md)
+    [CHANGELOG.md](https://github.com/jendrikseipp/vulture/blob/main/CHANGELOG.md)
   - Roadmap:
-    [TODO.md](https://github.com/jendrikseipp/vulture/blob/master/TODO.md)
+    [TODO.md](https://github.com/jendrikseipp/vulture/blob/main/TODO.md)
diff --git a/vulture/noqa.py b/vulture/noqa.py
index 61abc905..b513e1d5 100644
--- a/vulture/noqa.py
+++ b/vulture/noqa.py
@@ -3,7 +3,7 @@
 
 NOQA_REGEXP = re.compile(
     # Use the same regex as flake8 does.
-    # https://gitlab.com/pycqa/flake8/-/tree/master/src/flake8/defaults.py
+    # https://gitlab.com/pycqa/flake8/-/tree/main/src/flake8/defaults.py
     # We're looking for items that look like this:
     # `# noqa`
     # `# noqa: E123`