diff --git a/features/aws-lambda/handled.feature b/features/aws-lambda/handled.feature
index ebb20a92..0060a70c 100644
--- a/features/aws-lambda/handled.feature
+++ b/features/aws-lambda/handled.feature
@@ -1,6 +1,5 @@
 # 3.9 is currently the minimum python version with a lambda runtime
-# 3.14 is not supported by the AWS `sam` CLI at the moment
-@not-python-3.5 @not-python-3.6 @not-python-3.7 @not-python-3.8 @not-python-3.14
+@not-python-3.5 @not-python-3.6 @not-python-3.7 @not-python-3.8
 Feature: Handled exceptions in AWS Lambda
 
 Scenario: Handled exceptions are delivered in an AWS Lambda app
diff --git a/features/aws-lambda/sessions.feature b/features/aws-lambda/sessions.feature
index 3e85cf99..ca3739ca 100644
--- a/features/aws-lambda/sessions.feature
+++ b/features/aws-lambda/sessions.feature
@@ -1,4 +1,4 @@
-@not-python-3.5 @not-python-3.6 @not-python-3.7 @not-python-3.8 @not-python-3.14
+@not-python-3.5 @not-python-3.6 @not-python-3.7 @not-python-3.8
 Feature: Sessions in AWS Lambda
 
 Scenario: Manually started sessions are delivered in an AWS Lambda app when auto_capture_sessions is True
diff --git a/features/aws-lambda/unhandled.feature b/features/aws-lambda/unhandled.feature
index c21d43f1..f3c0acb6 100644
--- a/features/aws-lambda/unhandled.feature
+++ b/features/aws-lambda/unhandled.feature
@@ -1,4 +1,4 @@
-@not-python-3.5 @not-python-3.6 @not-python-3.7 @not-python-3.8 @not-python-3.14
+@not-python-3.5 @not-python-3.6 @not-python-3.7 @not-python-3.8
 Feature: Unhandled exceptions in AWS Lambda
 
 Scenario: Unhandled exceptions are delivered in an AWS Lambda app
diff --git a/features/support/env.rb b/features/support/env.rb
index 9f3ae675..1fb69453 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -15,12 +15,12 @@ def current_ip
   Maze.config.file_log = false
   Maze.config.log_requests = true
 
-  # don't wait so long for requests/not to receive requests
-  Maze.config.receive_requests_wait = 10
-  Maze.config.receive_no_requests_wait = 10
+  # Increased timeout to 20s for AWS Lambda cold starts (especially Python 3.12+)
+  Maze.config.receive_requests_wait = 20
+  Maze.config.receive_no_requests_wait = 20
 
-  # warn if a test takes more than 5 seconds to send a request
-  Maze.config.receive_requests_slow_threshold = 5
+  # warn if a test takes more than 10 seconds to send a request
+  Maze.config.receive_requests_slow_threshold = 10
 
   # bugsnag-python doesn't need to send the integrity header
   Maze.config.enforce_bugsnag_integrity = false
diff --git a/tests/integrations/test_asgi.py b/tests/integrations/test_asgi.py
index e998f32f..bb5bed88 100644
--- a/tests/integrations/test_asgi.py
+++ b/tests/integrations/test_asgi.py
@@ -39,11 +39,12 @@ def test_routing_crash(self):
         async def other_func():
             raise ScaryException('fell winds!')
 
-        @app.route('/')
         async def index(req):
             await other_func()
             return PlainTextResponse('pineapple')
 
+        app.add_route('/', index)
+
         app = TestClient(BugsnagMiddleware(app))
 
         self.assertRaises(ScaryException, lambda: app.get('/'))
@@ -77,11 +78,12 @@ def test_enable_environment(self):
         async def other_func():
             raise ScaryException('fell winds!')
 
-        @app.route('/')
         async def index(req):
             await other_func()
             return PlainTextResponse('pineapple')
 
+        app.add_route('/', index)
+
         app = TestClient(BugsnagMiddleware(app))
 
         self.assertRaises(ScaryException, lambda: app.get('/'))
@@ -106,11 +108,12 @@ def test_headers_are_filtered(self):
         async def other_func():
             raise ScaryException('fell winds!')
 
-        @app.route('/')
         async def index(req):
             await other_func()
             return PlainTextResponse('pineapple')
 
+        app.add_route('/', index)
+
         app = TestClient(BugsnagMiddleware(app))
 
         self.assertRaises(
@@ -159,11 +162,12 @@ async def next_func():
             bugsnag.configure_request(metadata={'wave': {'size': '35b'}})
             raise ScaryException('fell winds!')
 
-        @app.route('/')
         async def index(req):
             await next_func()
             return PlainTextResponse('pineapple')
 
+        app.add_route('/', index)
+
         app = TestClient(BugsnagMiddleware(app))
 
         self.assertRaises(ScaryException, lambda: app.get('/'))
@@ -229,10 +233,11 @@ async def app(scope, receive, send):
     def test_url_components(self):
         app = Starlette()
 
-        @app.route('/path')
         async def index(req):
             raise ScaryException('forgot the map')
 
+        app.add_route('/path', index)
+
         app = TestClient(BugsnagMiddleware(app))
 
         self.assertRaises(
@@ -261,11 +266,12 @@ def test_breadcrumb_records_the_referer_header(self):
         async def other_func():
             raise ScaryException('fell winds!')
 
-        @app.route('/')
         async def index(req):
             await other_func()
             return PlainTextResponse('pineapple')
 
+        app.add_route('/', index)
+
         app = TestClient(BugsnagMiddleware(app))
         headers = {'referer': 'http://testserver/abc/xyz?password=hunter2'}
 
@@ -305,13 +311,14 @@ def test_chained_exceptions(self):
         async def other_func():
             raise ScaryException('fell winds!')
 
-        @app.route('/')
         async def index(req):
             try:
                 await other_func()
             except ScaryException as scary:
                 raise Exception('disconcerting breeze.') from scary
 
+        app.add_route('/', index)
+
         app = TestClient(BugsnagMiddleware(app))
 
         with pytest.raises(Exception):
@@ -351,7 +358,6 @@ async def other_func():
 
             raise ScaryException('fell winds!')
 
-        @app.route('/')
         async def index(req):
             nonlocal count
             count += 1
@@ -360,6 +366,8 @@ async def index(req):
             await other_func()
             return PlainTextResponse('pineapple')
 
+        app.add_route('/', index)
+
         app = TestClient(BugsnagMiddleware(app))
 
         with pytest.raises(Exception):