diff --git a/pkgs/development/python-modules/mailchecker/default.nix b/pkgs/development/python-modules/mailchecker/default.nix
index c78d5c7baeea..23146a4f5a7c 100644
--- a/pkgs/development/python-modules/mailchecker/default.nix
+++ b/pkgs/development/python-modules/mailchecker/default.nix
@@ -6,14 +6,14 @@
 
 buildPythonPackage rec {
   pname = "mailchecker";
-  version = "4.1.11";
+  version = "4.1.12";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-PmPl2P72K9VYby+Kkt4LOGXYPt7nhu43LEmuv4ha1yA=";
+    hash = "sha256-AqpT2Mqo5bjmKsu6WzVw/+AUOaSwlDfmXO0ufB6uc8A=";
   };
 
   # Module has no tests