diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 1fb92be..529528e 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -15,7 +15,8 @@ jobs:
       fail-fast: false
       matrix:
         gap-version:
-          - master
+          - 'devel'
+          - '4.15'
           - '4.14'
           - '4.13'
           - '4.12'
diff --git a/README.md b/README.md
index a66778f..66cae99 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gap-actions/setup-gap@v3
       - uses: gap-actions/build-pkg@v2
       - uses: gap-actions/run-pkg-tests@v4