diff --git a/.github/workflows/antsibull-docs.yml b/.github/workflows/antsibull-docs.yml
index c795727c..4037103a 100644
--- a/.github/workflows/antsibull-docs.yml
+++ b/.github/workflows/antsibull-docs.yml
@@ -57,9 +57,9 @@ jobs:
       - name: Check out dependent project antsibull-core
         uses: actions/checkout@v4
         with:
-          repository: ansible-community/antsibull-core
+          repository: felixfontein/antsibull-core
           path: antsibull-core
-          ref: ${{ matrix.antsibull_core_ref }}
+          ref: pydantic-lint
 
       - name: Check out dependent project antsibull-docs-parser
         uses: actions/checkout@v4
@@ -188,8 +188,9 @@ jobs:
       - name: Check out dependent project antsibull-core
         uses: actions/checkout@v4
         with:
-          repository: ansible-community/antsibull-core
+          repository: felixfontein/antsibull-core
           path: antsibull-core
+          ref: pydantic-lint
 
       - name: Check out dependent project antsibull-docs-parser
         uses: actions/checkout@v4
@@ -267,8 +268,9 @@ jobs:
       - name: Check out dependent project antsibull-core
         uses: actions/checkout@v4
         with:
-          repository: ansible-community/antsibull-core
+          repository: felixfontein/antsibull-core
           path: antsibull-core
+          ref: pydantic-lint
 
       - name: Check out dependent project antsibull-docs-parser
         uses: actions/checkout@v4
diff --git a/.github/workflows/nox.yml b/.github/workflows/nox.yml
index 9a772dd2..4d29750a 100644
--- a/.github/workflows/nox.yml
+++ b/.github/workflows/nox.yml
@@ -51,8 +51,9 @@ jobs:
       - name: Check out dependent project antsibull-core
         uses: actions/checkout@v4
         with:
-          repository: ansible-community/antsibull-core
+          repository: felixfontein/antsibull-core
           path: antsibull-core
+          ref: pydantic-lint
       - name: Check out dependent project antsibull-docs-parser
         uses: actions/checkout@v4
         with: