diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
index 7293ba77efd9..0e1c858b5f74 100644
--- a/.github/workflows/build_and_test.yml
+++ b/.github/workflows/build_and_test.yml
@@ -44,6 +44,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # `git merge-base` requires the history
 
     - name: Get Old Kong Version
       id: old-kong-version