diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 8bbec48..6ffef5f 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -13,5 +13,4 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:993a058718e84a82fda04c3177e58f0a43281a996c7c395e0a56ccc4d6d210d7
-
+  digest: sha256:a31c2fd2f28e994254f6367b44e112722f3263247798ae222d7986bb12328ec3
diff --git a/samples/snippets/noxfile.py b/samples/snippets/noxfile.py
index 5fcb9d7..0398d72 100644
--- a/samples/snippets/noxfile.py
+++ b/samples/snippets/noxfile.py
@@ -207,8 +207,8 @@ def _session_tests(
     session: nox.sessions.Session, post_install: Callable = None
 ) -> None:
     # check for presence of tests
-    test_list = glob.glob("*_test.py") + glob.glob("test_*.py")
-    test_list.extend(glob.glob("tests"))
+    test_list = glob.glob("**/*_test.py", recursive=True) + glob.glob("**/test_*.py", recursive=True)
+    test_list.extend(glob.glob("**/tests", recursive=True))
 
     if len(test_list) == 0:
         print("No tests found, skipping directory.")