diff --git a/custom_docker_image/requirements.txt b/custom_docker_image/requirements.txt
index 1c1bb0f..c0127f5 100644
--- a/custom_docker_image/requirements.txt
+++ b/custom_docker_image/requirements.txt
@@ -4,7 +4,7 @@ dill==0.2.8.2
 google-api-python-client==1.7.3
 google-auth-httplib2==0.0.3
 google-cloud-storage==1.10.0
-PyYAML==5.1.2
+PyYAML==5.4
 freezegun==0.3.12
 flask-restful==0.3.7
 Flask==1.1.1