diff --git a/pkgs/development/python-modules/magic-wormhole-mailbox-server/default.nix b/pkgs/development/python-modules/magic-wormhole-mailbox-server/default.nix
index 189a94dbf726..cb6e32f70867 100644
--- a/pkgs/development/python-modules/magic-wormhole-mailbox-server/default.nix
+++ b/pkgs/development/python-modules/magic-wormhole-mailbox-server/default.nix
@@ -12,13 +12,13 @@
   pytestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "magic-wormhole-mailbox-server";
   version = "0.5.1";
   pyproject = true;
 
   src = fetchPypi {
-    inherit pname version;
+    inherit (finalAttrs) pname version;
     hash = "sha256-oAegNnIpMgRldoHb9QIEXW1YF8V/mq4vIibm6hoAjKE=";
   };
 
@@ -52,8 +52,8 @@ buildPythonPackage rec {
   meta = {
     description = "Securely transfer data between computers";
     homepage = "https://github.com/magic-wormhole/magic-wormhole-mailbox-server";
-    changelog = "https://github.com/magic-wormhole/magic-wormhole-mailbox-server/blob/${version}/NEWS.md";
+    changelog = "https://github.com/magic-wormhole/magic-wormhole-mailbox-server/blob/refs/tags/${finalAttrs.version}/NEWS.md";
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.mjoerg ];
   };
-}
+})