diff --git a/.github/workflows/gap.yml b/.github/workflows/gap.yml
index 5a320da2c..e6b929202 100644
--- a/.github/workflows/gap.yml
+++ b/.github/workflows/gap.yml
@@ -56,7 +56,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: 'gap-system/gap'
-          ref: 'master'
+          ref: 'v4.13.0'
           path: 'GAPROOT'
       - name: "Build GAP"
         run: |