diff --git a/pkgs/by-name/di/diffoscope/package.nix b/pkgs/by-name/di/diffoscope/package.nix
index ae45896fed38..f2f8bfe99483 100644
--- a/pkgs/by-name/di/diffoscope/package.nix
+++ b/pkgs/by-name/di/diffoscope/package.nix
@@ -98,6 +98,11 @@ let
             tag = version;
             hash = "sha256-ZYEjT/yShfA4+zpbGOtaFOx1nSSOWPtMvskPhHv3c9U=";
           };
+
+          postPatch = ''
+            substituteInPlace py_ext/setup.py \
+              --replace-fail "0.2.0" "${version}"
+          '';
         }
       );
     };