diff --git a/bigquery/bqml/requirements.txt b/bigquery/bqml/requirements.txt
index 6a6d69156796..cd07776e7c68 100644
--- a/bigquery/bqml/requirements.txt
+++ b/bigquery/bqml/requirements.txt
@@ -1,4 +1,4 @@
 pandas==1.0.3
 google-cloud-bigquery==1.23.1
 flaky==3.6.1
-mock==3.0.5
+mock==4.0.2
diff --git a/container_registry/container_analysis/requirements.txt b/container_registry/container_analysis/requirements.txt
index dddaaacd8518..d922ac336844 100644
--- a/container_registry/container_analysis/requirements.txt
+++ b/container_registry/container_analysis/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