diff --git a/api_server/requirements.txt b/api_server/requirements.txt
index d2a0e31..170c9e5 100644
--- a/api_server/requirements.txt
+++ b/api_server/requirements.txt
@@ -21,7 +21,7 @@ Pillow==5.2.0
 post==2019.4.13
 protobuf==3.8.0
 public==2019.4.13
-PyYAML==5.1
+PyYAML==5.4
 query-string==2019.4.13
 request==2019.4.13
 scipy==1.0.0