diff --git a/pkgs/development/python-modules/cerberus11/default.nix b/pkgs/development/python-modules/cerberus11/default.nix
index 81f6ef1e8371..614e3ca81350 100644
--- a/pkgs/development/python-modules/cerberus11/default.nix
+++ b/pkgs/development/python-modules/cerberus11/default.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "Cerberus";
-  version = "1.3.1";
+  version = "1.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0be48fc0dc84f83202a5309c0aa17cd5393e70731a1698a50d118b762fbe6875";
+    sha256 = "1pxzr8sfm2hc5s96m9k044i44nwkva70n0ypr6a35v73zn891cx5";
   };
 
   checkInputs = [ pytestrunner pytest ];