diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9861314..00a1922 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,3 +23,17 @@ jobs:
         nc -z localhost 5005
         sleep 2
         kill $PID
+
+  code_standards:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+    - uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
+      with:
+        python-version: 3.9.25
+        cache: 'pip'
+    - run: pip install -r requirements-dev.txt
+      id: pip
+    - run: black --check .
+    - run: flake8 .
+      if: success() || failure() && steps.pip.outcome == 'success'
diff --git a/extensions/override/override.py b/extensions/override/override.py
index cba22e8..5a0937a 100644
--- a/extensions/override/override.py
+++ b/extensions/override/override.py
@@ -26,7 +26,6 @@
 
 
 def get_override_status():
-    global override_active
     return override_active
 
 
diff --git a/extensions/waybackmachine/waybackmachine.py b/extensions/waybackmachine/waybackmachine.py
index 95ab92b..f7612d9 100644
--- a/extensions/waybackmachine/waybackmachine.py
+++ b/extensions/waybackmachine/waybackmachine.py
@@ -99,7 +99,6 @@
 
 
 def get_override_status():
-    global override_active
     return override_active
 
 
diff --git a/proxy.py b/proxy.py
index aa807a2..a69a7b3 100644
--- a/proxy.py
+++ b/proxy.py
@@ -197,7 +197,6 @@ def handle_image_request(url):
 @app.route("/", defaults={"path": "/"}, methods=["GET", "POST"])
 @app.route("/<path:path>", methods=["GET", "POST"])
 def handle_request(path):
-    global override_extension
     parsed_url = urlparse(request.url)
     scheme = parsed_url.scheme
     host = parsed_url.netloc.split(":")[0]  # Remove port if present
@@ -385,7 +384,11 @@ def process_response(response, url):
 
     response = Response(content, status_code)
     for key, value in headers.items():
-        if key.lower() not in ["content-encoding", "content-length", "transfer-encoding"]:
+        if key.lower() not in [
+            "content-encoding",
+            "content-length",
+            "transfer-encoding",
+        ]:
             response.headers[key] = value
 
     debug_print("Finished processing response")