diff --git a/pkgs/development/python-modules/python-benedict/default.nix b/pkgs/development/python-modules/python-benedict/default.nix
index ada0ded7e79a..96601c6750ac 100644
--- a/pkgs/development/python-modules/python-benedict/default.nix
+++ b/pkgs/development/python-modules/python-benedict/default.nix
@@ -32,6 +32,11 @@ buildPythonPackage rec {
     hash = "sha256-WSsT+p23VctVt9A+WFKNHcgUHFijfT775eMF3RzaXDA=";
   };
 
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "mailchecker >= 4.1.0, < 5.0.0" "mailchecker >= 4.1.0"
+  '';
+
   propagatedBuildInputs = [
     mailchecker
     phonenumbers