diff --git a/.github/workflows/python_tests.yaml b/.github/workflows/python_tests.yaml
index b2f3cfe..a044540 100644
--- a/.github/workflows/python_tests.yaml
+++ b/.github/workflows/python_tests.yaml
@@ -18,6 +18,12 @@ jobs:
     steps:
     - name: Check out code
       uses: actions/checkout@v2
+      with:
+        # Check out pull request's HEAD commit instead of the merge commit to
+        # work around an issue where wrong a commit is being checked out.
+        # For more details, see:
+        # https://github.com/actions/checkout/issues/299.
+        ref: ${{ github.event.pull_request.head.sha }}
 
     - name: Set up Python 3.10
       uses: actions/setup-python@v2
diff --git a/Makefile b/Makefile
index 572295d..163db48 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,8 @@ format:
 init-python-sdk:
 	cd python-sdk; pip install -e '.[dev]' -U
 
-init: init-python-sdk init-server
+init:
+	echo "TESTING-PULLREQUEST-TARGET"
 
 init-server:
 	cd server; npm install