diff --git a/pkgs/development/python-modules/karton-yaramatcher/default.nix b/pkgs/development/python-modules/karton-yaramatcher/default.nix
index ac4a7b05b91..6183e950005 100644
--- a/pkgs/development/python-modules/karton-yaramatcher/default.nix
+++ b/pkgs/development/python-modules/karton-yaramatcher/default.nix
@@ -22,11 +22,6 @@ buildPythonPackage rec {
     yara-python
   ];
 
-  postPatch = ''
-    substituteInPlace requirements.txt \
-      --replace "yara-python==4.0.2" "yara-python" \
-  '';
-
   checkPhase = ''
     runHook preCheck
     ${python.interpreter} -m unittest discover