diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 683089d1..f523cb97 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,7 +3,7 @@ name: test
 on:
   push:
     branches:
-      - master
+      - main
       - '*.x'
     tags:
       - '*'
diff --git a/.github/workflows/test_devdeps.yml b/.github/workflows/test_devdeps.yml
index e4d90d42..63697c88 100644
--- a/.github/workflows/test_devdeps.yml
+++ b/.github/workflows/test_devdeps.yml
@@ -3,7 +3,7 @@ name: test with development versions
 on:
   push:
     branches:
-      - master
+      - main
       - '*.x'
     tags:
       - '*'
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index effe1d08..2fb585dc 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,6 @@
 Please open a new issue or new pull request for bugs, feedback, or new features you would like to see. If there is an issue you would like to work on, please leave a comment and we will be happy to assist. New contributions and contributors are very welcome!
 
-The main development work is done on the "master" branch. The "stable" branch is protected and used for official releases. The rest of the branches are for release maintenance and should not be used normally. Unless otherwise told by a maintainer, pull requests should be made and submitted to the "master" branch.
+The main development work is done on the "main" branch. The "stable" branch is protected and used for official releases. The rest of the branches are for release maintenance and should not be used normally. Unless otherwise told by a maintainer, pull requests should be made and submitted to the "main" branch.
 
 New to GitHub or open source projects? If you are unsure about where to start or haven't used GitHub before, please feel free to contact the package maintainers.
 
diff --git a/README.md b/README.md
index ce0a8841..6f2301f9 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![CI](https://github.com/spacetelescope/stdatamodels/actions/workflows/ci.yml/badge.svg)](https://github.com/spacetelescope/stdatamodels/actions/workflows/ci.yml)
 
-[![codecov](https://codecov.io/gh/spacetelescope/stdatamodels/branch/master/graph/badge.svg?token=TrmUKaTP2t)](https://codecov.io/gh/spacetelescope/stdatamodels)
+[![codecov](https://codecov.io/gh/spacetelescope/stdatamodels/branch/main/graph/badge.svg?token=TrmUKaTP2t)](https://codecov.io/gh/spacetelescope/stdatamodels)
 
 
 Provides `DataModel`, which is the base class for data models implemented in the JWST and Roman calibration software.