diff --git a/.github/workflows/api-typo3-org.yml b/.github/workflows/api-typo3-org.yml
index e8c6b12..1e17a72 100644
--- a/.github/workflows/api-typo3-org.yml
+++ b/.github/workflows/api-typo3-org.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        core: ['main', '12.4', '11.5']
+        core: ['main', '13.4', '12.4', '11.5']
     env:
       TARGET_PATH: ${{ secrets.API_TARGET_PATH }}/${{ matrix.core }}
     steps: