diff --git a/pkgs/development/python-modules/icalendar/default.nix b/pkgs/development/python-modules/icalendar/default.nix
index 1418c925ebf8..81c97a0ee48e 100644
--- a/pkgs/development/python-modules/icalendar/default.nix
+++ b/pkgs/development/python-modules/icalendar/default.nix
@@ -7,12 +7,12 @@
 }:
 
 buildPythonPackage rec {
-  version = "4.0.5";
+  version = "4.0.6";
   pname = "icalendar";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "14ynjj65kfmlcvpb7k097w789wvxncd3cr3xz5m1jz9yl9v6vv5q";
+    sha256 = "17wpvngxv9q333ng3hm4k1qhiafmzipr7l2liwny7ar24qiyfvvy";
   };
 
   buildInputs = [ setuptools ];