diff --git a/requirements.txt b/requirements.txt
index cead1a304..37cff66fc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ simplejson==3.17.5
 six==1.16.0
 webdavclient3==3.14.6
 whitenoise==5.3.0
-icalendar==4.0.7
+icalendar==4.0.9
 pyyaml==6.0
 uritemplate==4.1.1
 beautifulsoup4==4.10.0