diff --git a/.github/workflows/_get-test-matrix.yml b/.github/workflows/_get-test-matrix.yml
index 09be978cb..deedaa949 100644
--- a/.github/workflows/_get-test-matrix.yml
+++ b/.github/workflows/_get-test-matrix.yml
@@ -38,7 +38,10 @@ jobs:
         run: |
           set -xe
           if [ "${{ github.event_name }}" == "pull_request" ] || [ "${{ github.event_name }}" == "pull_request_target" ]; then
-            base_commit=${{ github.event.pull_request.base.sha }}
+            LATEST_COMMIT_SHA=$(curl -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            "https://api.github.com/repos/opea-project/GenAIComps/commits?sha=main" | jq -r '.[0].sha')
+            echo "Latest commit SHA is $LATEST_COMMIT_SHA"
+            base_commit=$LATEST_COMMIT_SHA
           else
             base_commit=$(git rev-parse HEAD~1) # push event
           fi
diff --git a/.github/workflows/pr-examples-test.yml b/.github/workflows/pr-examples-test.yml
index 302d6f8e1..a3eb50539 100644
--- a/.github/workflows/pr-examples-test.yml
+++ b/.github/workflows/pr-examples-test.yml
@@ -16,6 +16,7 @@ on:
       - comps/llms/text-generation/tgi/**
       - comps/dataprep/redis/langchain/**
       - requirements.txt
+      - "!**.md"
 
 # If there is a new commit, the previous jobs will be canceled
 concurrency: