diff --git a/container_registry/container_analysis/snippets/requirements.txt b/container_registry/container_analysis/snippets/requirements.txt
index dddaaacd8518..d922ac336844 100644
--- a/container_registry/container_analysis/snippets/requirements.txt
+++ b/container_registry/container_analysis/snippets/requirements.txt
@@ -4,4 +4,4 @@ grafeas==0.1.0
 pytest==5.3.0; python_version > "3.0"
 pytest==4.6.6; python_version < "3.0"
 flaky==3.6.1
-mock==3.0.5
+mock==4.0.2