diff --git a/requirements.txt b/requirements.txt
index ad8e133..7601205 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ Flask
 Keras==2.1.5
 Markdown==2.6.11
 Pillow==6.2.0
-PyYAML==5.1
+PyYAML==5.4
 Werkzeug==0.15.3
 absl-py==0.1.11
 astor==0.6.2