diff --git a/Pipfile b/Pipfile
index a72c28c3..09c5f784 100644
--- a/Pipfile
+++ b/Pipfile
@@ -16,5 +16,5 @@ jinja2 = "==2.10.1"
 icalendar = "==4.0.4"
 trans = "==2.1.0"
 mistune = "==0.8.4"
-pyyaml = "==5.3"
+pyyaml = "==5.4"
 flask-babel = "==1.0.0"