diff --git a/pkgs/development/python-modules/cffsubr/default.nix b/pkgs/development/python-modules/cffsubr/default.nix
index d82f3ff012c1..e86277cf2782 100644
--- a/pkgs/development/python-modules/cffsubr/default.nix
+++ b/pkgs/development/python-modules/cffsubr/default.nix
@@ -11,12 +11,12 @@
 
 buildPythonPackage rec {
   pname = "cffsubr";
-  version = "0.3.0";
+  version = "0.2.9.post1";
   format = "pyproject";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-d0UVC9uBZ5+s3RHB87hwlsT029SVfo/Ou4jEVoeVLvs=";
+    hash = "sha256-azFBLc9JyPqEZkvahn4u3cVbb+b6aW/yU8TxOp/y/Fw=";
   };
 
   patches = [