diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 0fed6b75..dc181d89 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,6 +1,6 @@
 {
     "name": "openai-chat-app-quickstart",
-    "image": "mcr.microsoft.com/devcontainers/python:3.11-bullseye",
+    "image": "mcr.microsoft.com/devcontainers/python:3.14-bullseye",
     "forwardPorts": [50505],
     "features": {
         "ghcr.io/azure/azure-dev/azd:latest": {}
diff --git a/.github/workflows/python-check.yaml b/.github/workflows/python-check.yaml
index 27503989..bb8d9357 100644
--- a/.github/workflows/python-check.yaml
+++ b/.github/workflows/python-check.yaml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest", "windows-latest"]
-        python_version: ["3.11"]
+        python_version: ["3.11", "3.12", "3.13", "3.14"]
     steps:
         - uses: actions/checkout@v5
         - name: Setup python
diff --git a/pyproject.toml b/pyproject.toml
index 54cc3dfa..5168d4b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.ruff]
 lint.select = ["E", "F", "I", "UP"]
-target-version = "py311"
+target-version = "py314"
 line-length = 120
 src = ["src"]
 
@@ -8,7 +8,7 @@ src = ["src"]
 known-first-party = ["quartapp"]
 
 [tool.black]
-target-version =  ["py311"]
+target-version =  ["py314"]
 line-length = 120
 
 [tool.pytest.ini_options]
diff --git a/src/Dockerfile b/src/Dockerfile
index fc1e5725..95474f46 100644
--- a/src/Dockerfile
+++ b/src/Dockerfile
@@ -1,5 +1,5 @@
 # ------------------- Stage 0: Base Stage ------------------------------
-FROM python:3.11-alpine AS base
+FROM python:3.14-alpine AS base
 
 WORKDIR /code
 
@@ -23,7 +23,7 @@ FROM base AS final
 
 RUN addgroup -S app && adduser -S app -G app
 
-COPY --from=build --chown=app:app /usr/local/lib/python3.11 /usr/local/lib/python3.11
+COPY --from=build --chown=app:app /usr/local/lib/python3.14 /usr/local/lib/python3.14
 COPY --from=build --chown=app:app /usr/local/bin /usr/local/bin
 COPY --from=build --chown=app:app /code /code
 
diff --git a/tests/mock_cred.py b/tests/mock_cred.py
index d8ea4a33..fc37e87d 100644
--- a/tests/mock_cred.py
+++ b/tests/mock_cred.py
@@ -2,4 +2,15 @@
 
 
 class MockAzureCredential(azure.core.credentials_async.AsyncTokenCredential):
-    pass
+    async def get_token(self, *scopes, **kwargs):
+        """Mock get_token method that returns a fake token."""
+        import time
+
+        from azure.core.credentials import AccessToken
+
+        # Return a mock token that expires in 1 hour
+        return AccessToken("mock_token", int(time.time()) + 3600)
+
+    async def close(self):
+        """Mock close method."""
+        pass