diff --git a/requirements.txt b/requirements.txt
index 974e8f7..8bb078a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ google-auth==1.10.0
 google-api-python-client==1.7.11
 icalendar==4.0.4
 pytz==2019.3
-PyYAML==5.2
+PyYAML==5.3