diff --git a/.github/workflows/isolated-tests.yml b/.github/workflows/isolated-tests.yml
index 81bfc4af3..00686cb54 100644
--- a/.github/workflows/isolated-tests.yml
+++ b/.github/workflows/isolated-tests.yml
@@ -18,6 +18,8 @@ jobs:
           coverage: none
 
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
 
       - name: Get Packages
         id: get_json
diff --git a/bin/build-changed-packages b/bin/build-changed-packages
index 914da1c9f..fb028f643 100755
--- a/bin/build-changed-packages
+++ b/bin/build-changed-packages
@@ -16,7 +16,7 @@ $composerPackages = [];
 
 foreach ($tempestPackages as $package) {
     // Find out if there are changes in this package.
-    $diff = exec(sprintf('git diff --name-only HEAD -- %s', $package['directory']));
+    $diff = exec(sprintf('git diff --name-only HEAD^ -- %s', $package['directory']));
 
     // If there are not any changes, move on to the next package.
     if (empty($diff)) {