diff --git a/vision/cloud-client/detect/detect_pdf_test.py b/vision/cloud-client/detect/detect_pdf_test.py
index f0f0b5f7126d..98b06aaab74f 100644
--- a/vision/cloud-client/detect/detect_pdf_test.py
+++ b/vision/cloud-client/detect/detect_pdf_test.py
@@ -25,14 +25,17 @@
 
 
 def test_async_detect_document(capsys):
+    storage_client = storage.Client()
+    bucket = storage_client.get_bucket(BUCKET)
+    assert len(list(bucket.list_blobs(prefix=OUTPUT_PREFIX))) == 0
+
     async_detect_document(
         gcs_source_uri=GCS_SOURCE_URI,
         gcs_destination_uri=GCS_DESTINATION_URI)
     out, _ = capsys.readouterr()
 
     assert 'Hodge conjecture' in out
+    assert len(list(bucket.list_blobs(prefix=OUTPUT_PREFIX))) == 3
 
-    storage_client = storage.Client()
-    bucket = storage_client.get_bucket(BUCKET)
     for blob in bucket.list_blobs(prefix=OUTPUT_PREFIX):
         blob.delete()
diff --git a/vision/cloud-client/detect/requirements.txt b/vision/cloud-client/detect/requirements.txt
index ca9d0e400b84..a6c769cef90d 100644
--- a/vision/cloud-client/detect/requirements.txt
+++ b/vision/cloud-client/detect/requirements.txt
@@ -1,2 +1,2 @@
-google-cloud-vision==0.30.1
+google-cloud-vision==0.31.0
 google-cloud-storage==1.6.0