diff --git a/default.nix b/default.nix
index 10aa1f5..5453d7b 100644
--- a/default.nix
+++ b/default.nix
@@ -14,13 +14,30 @@ self: super: rec {
         ];
         propagatedBuildInputs = with self.python39Packages; [
           typing-extensions
-          graphql-core
+          # graphql-core
           python-multipart
           python-dateutil
           flask
           pydantic
           pygments
           poetry
+          (buildPythonPackage rec {
+            pname = "graphql-core";
+            version = "3.2.0";
+            format = "setuptools";
+            src = fetchPypi {
+              inherit pname version;
+              sha256 = "sha256-huKgvgCL/eGe94OI3opyWh2UKpGQykMcJKYIN5c4A84=";
+            };
+            checkInputs = [
+              pytest-asyncio
+              pytest-benchmark
+              pytestCheckHook
+            ];
+            pythonImportsCheck = [
+              "graphql"
+            ];
+          })
         ];
         src = python-super.fetchPypi {
           inherit pname version;