diff --git a/app/requirements.txt b/app/requirements.txt
index 78ced11..64563fd 100644
--- a/app/requirements.txt
+++ b/app/requirements.txt
@@ -29,7 +29,7 @@ python-dateutil==2.8.0
 python-editor==1.0.4
 python-frontmatter==0.4.5
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 requests==2.22.0
 six==1.12.0
 SQLAlchemy==1.3.5