diff --git a/requirements.txt b/requirements.txt
index 9b8591d..1a86252 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ Pillow>=6.2.2
 protobuf==3.7.1
 pyparsing==2.4.0
 python-dateutil==2.8.0
-PyYAML==5.1
+PyYAML==5.4
 scipy==1.2.1
 six==1.12.0
 tb-nightly==1.14.0a20190301