diff --git a/pkgs/development/python-modules/item-synchronizer/default.nix b/pkgs/development/python-modules/item-synchronizer/default.nix
index 5b4e55349971..85f0332c71da 100644
--- a/pkgs/development/python-modules/item-synchronizer/default.nix
+++ b/pkgs/development/python-modules/item-synchronizer/default.nix
@@ -19,12 +19,13 @@ buildPythonPackage rec {
     hash = "sha256-+mviKtCLlJhYV576Q07kcFJvtls5qohKSrqZtBqE/s4=";
   };
 
-  postPatch = ''
-    substituteInPlace pyproject.toml --replace-fail 'bidict = "^0.21.4"' 'bidict = "^0.23"'
-  '';
-
   nativeBuildInputs = [ poetry-core ];
 
+  pythonRelaxDeps = [
+    "bidict"
+    "bubop"
+  ];
+
   propagatedBuildInputs = [
     bidict
     bubop