diff --git a/pkgs/development/python-modules/certbot-dns-inwx/default.nix b/pkgs/development/python-modules/certbot-dns-inwx/default.nix
index b7627f60f3ce..f2feccfe7f7d 100644
--- a/pkgs/development/python-modules/certbot-dns-inwx/default.nix
+++ b/pkgs/development/python-modules/certbot-dns-inwx/default.nix
@@ -6,18 +6,19 @@
   acme,
   certbot,
   inwx-domrobot,
+  idna,
 }:
 
 buildPythonPackage rec {
   pname = "certbot-dns-inwx";
-  version = "3.0.2";
+  version = "3.0.3";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "oGGy990";
     repo = "certbot-dns-inwx";
     tag = "v${version}";
-    hash = "sha256-x4wDg36J9MvXXHBxUMCoHO3p6c3FKBBB879CpxG/1NA=";
+    hash = "sha256-bI/CSTYy/W1AwbxnBxhMp/yFnp68G25mTkNUbdNsRZ4=";
   };
 
   build-system = [ setuptools ];
@@ -28,6 +29,10 @@ buildPythonPackage rec {
     inwx-domrobot
   ];
 
+  optional-dependencies = {
+    idna = [ idna ];
+  };
+
   # Doesn't have any tests
   doCheck = false;