diff --git a/pyproject.toml b/pyproject.toml
index 5f861d4bf..d38ecb88c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -76,7 +76,7 @@ dependencies = [
         # User
         "drf-nested-routers",
         "vobject",
-        "caldav==2.2.3",
+        "caldav==2.2.6",
         # Amavis
         "html2text",
         "idna",