diff --git a/requirements.txt b/requirements.txt
index 9c23e58..ce13136 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,7 +39,7 @@ python-dateutil==2.8.1
 python-dotenv==0.13.0
 python-editor==1.0.4
 pytz==2020.1
-PyYAML==5.3.1
+PyYAML==5.4
 six==1.15.0
 SQLAlchemy==1.3.17
 supermemo2==0.0.4