diff --git a/pkgs/by-name/pr/pretalx/package.nix b/pkgs/by-name/pr/pretalx/package.nix
index bbfd52c1ad24..6313a6748b8d 100644
--- a/pkgs/by-name/pr/pretalx/package.nix
+++ b/pkgs/by-name/pr/pretalx/package.nix
@@ -1,7 +1,7 @@
 { lib
 , buildNpmPackage
 , gettext
-, python311
+, python3
 , fetchFromGitHub
 , fetchpatch2
 , plugins ? [ ]
@@ -9,7 +9,7 @@
 }:
 
 let
-  python = python311.override {
+  python = python3.override {
     packageOverrides = final: prev: {
       django-bootstrap4 = prev.django-bootstrap4.overridePythonAttrs (oldAttrs: rec {
         version = "3.0.0";
diff --git a/pkgs/development/python-modules/django-graphiql-debug-toolbar/default.nix b/pkgs/development/python-modules/django-graphiql-debug-toolbar/default.nix
index 60a3ed0de63e..63140be2e28b 100644
--- a/pkgs/development/python-modules/django-graphiql-debug-toolbar/default.nix
+++ b/pkgs/development/python-modules/django-graphiql-debug-toolbar/default.nix
@@ -3,11 +3,19 @@
   buildPythonPackage,
   pythonOlder,
   fetchFromGitHub,
+
+  # build-system
   poetry-core,
+
+  # dependencies
   django,
   django-debug-toolbar,
   graphene-django,
+
+  # tests
   python,
+  pytest-django,
+  pytestCheckHook
 }:
 
 buildPythonPackage rec {
@@ -33,17 +41,19 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "graphiql_debug_toolbar" ];
 
-  DB_BACKEND = "sqlite";
-  DB_NAME = ":memory:";
-  DJANGO_SETTINGS_MODULE = "tests.settings";
+  nativeCheckInputs = [
+    pytest-django
+    pytestCheckHook
+  ];
 
-  checkPhase = ''
-    runHook preCheck
-    ${python.interpreter} -m django test tests
-    runHook postCheck
+  preCheck = ''
+    export DB_BACKEND=sqlite
+    export DB_NAME=:memory:
+    export DJANGO_SETTINGS_MODULE=tests.settings
   '';
 
   meta = with lib; {
+    changelog = "https://github.com/flavors/django-graphiql-debug-toolbar/releases/tag/${src.rev}";
     description = "Django Debug Toolbar for GraphiQL IDE";
     homepage = "https://github.com/flavors/django-graphiql-debug-toolbar";
     license = licenses.mit;
diff --git a/pkgs/development/python-modules/graphene/default.nix b/pkgs/development/python-modules/graphene/default.nix
index 14fcdeb744e7..bea97bea98f7 100644
--- a/pkgs/development/python-modules/graphene/default.nix
+++ b/pkgs/development/python-modules/graphene/default.nix
@@ -37,6 +37,9 @@ buildPythonPackage rec {
     graphql-relay
   ];
 
+  # snaphottest->fastdiff->wasmer dependency chain does not support 3.12.
+  doCheck = pythonOlder "3.12";
+
   nativeCheckInputs = [
     pytest7CheckHook
     pytest-asyncio