diff --git a/.github/workflows/testing.yaml b/.github/workflows/testing.yaml
index ea51b5b..7f71109 100644
--- a/.github/workflows/testing.yaml
+++ b/.github/workflows/testing.yaml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.11", "3.12" ]
+        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
         fastapi-version: [ "0.103.2", "0.111.1"]
     steps:
       - name: Check out repository
diff --git a/.gitignore b/.gitignore
index 89e84fb..697a452 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 *.pyc
 .idea/*
+.vscode
 env/
 demo_project/.env
 .DS_Store
diff --git a/fastapi_azure_auth/exceptions.py b/fastapi_azure_auth/exceptions.py
index 336cb95..8e778bf 100644
--- a/fastapi_azure_auth/exceptions.py
+++ b/fastapi_azure_auth/exceptions.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from fastapi import HTTPException, WebSocketException, status
 from starlette.requests import HTTPConnection
 
diff --git a/tests/test_user.py b/tests/test_user.py
index f91f040..205555f 100644
--- a/tests/test_user.py
+++ b/tests/test_user.py
@@ -85,7 +85,7 @@ def test_guest_user(claims: Dict[str, str], expected: bool):
 
 
 def get_utc_now_as_unix_timestamp() -> int:
-    date = datetime.datetime.now(datetime.UTC)
+    date = datetime.datetime.now(datetime.timezone.utc)
     return calendar.timegm(date.utctimetuple())