diff --git a/requirements.txt b/requirements.txt
index b173242..2cb8ae5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ numpy==1.16.3
 opencv-contrib-python==4.1.0.25
 Pillow==6.1.0
 protobuf==3.8.0
-PyYAML==5.1.1
+PyYAML==5.4
 scikit-learn==0.21.2
 scipy==1.3.0
 six==1.12.0