diff --git a/requirements.txt b/requirements.txt
index 8d7a6bac..0bba18fc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ django-toolbelt==0.0.1
 premailer==3.1.1
 django-widget-tweaks==1.4.1
 gunicorn==19.7.1
-icalendar==3.11.5
+icalendar==3.11.6
 lxml==3.8.0
 Markdown==2.6.8
 Pillow==4.2.1