diff --git a/pkgs/development/python-modules/mailchecker/default.nix b/pkgs/development/python-modules/mailchecker/default.nix
index 2ff30608fd7f..36b1e9f42d14 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 = "4.1.19";
+  version = "5.0.0";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-oNIh9mRdPXai6SDfyvfoOrgsbVWyRYhJva+bsqgGOoo=";
+    hash = "sha256-d8RG/PSWPHvQy7o9tPLPGrEp0r/Y3JWwWoT3cS4iR38=";
   };
 
   # Module has no tests