diff --git a/pkgs/development/python-modules/thinc/default.nix b/pkgs/development/python-modules/thinc/default.nix
index 9524f7e44970..bb408e0efbff 100644
--- a/pkgs/development/python-modules/thinc/default.nix
+++ b/pkgs/development/python-modules/thinc/default.nix
@@ -39,6 +39,11 @@ buildPythonPackage rec {
     sha256 = "sha256-R2YqOuM9RFp3tup7dyREgFx7uomR8SLjUNr3Le3IFxo=";
   };
 
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace "pydantic>=1.7.4,!=1.8,!=1.8.1,<1.9.0" "pydantic"
+  '';
+
   buildInputs = [
     cython
   ] ++ lib.optionals stdenv.isDarwin [