diff --git a/homeassistant/components/caldav/manifest.json b/homeassistant/components/caldav/manifest.json
index d0e0bd0b1d0..3b201c79e0c 100644
--- a/homeassistant/components/caldav/manifest.json
+++ b/homeassistant/components/caldav/manifest.json
@@ -6,5 +6,5 @@
   "documentation": "https://www.home-assistant.io/integrations/caldav",
   "iot_class": "cloud_polling",
   "loggers": ["caldav", "vobject"],
-  "requirements": ["caldav==1.6.0", "icalendar==6.1.0"]
+  "requirements": ["caldav==1.6.0", "icalendar==6.3.1"]
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index 5af92b3b745..6c3b27b3fe5 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1216,7 +1216,7 @@ ibmiotf==0.3.4
 ical==11.0.0
 
 # homeassistant.components.caldav
-icalendar==6.1.0
+icalendar==6.3.1
 
 # homeassistant.components.ping
 icmplib==3.0
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 2220389d5ec..5443891fc18 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1056,7 +1056,7 @@ ibeacon-ble==1.2.0
 ical==11.0.0
 
 # homeassistant.components.caldav
-icalendar==6.1.0
+icalendar==6.3.1
 
 # homeassistant.components.ping
 icmplib==3.0