diff --git a/pyproject.toml b/pyproject.toml
index 518a86e8..dba836ff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -122,9 +122,11 @@ warn_unreachable = true
 disallow_any_unimported = true
 extra_checks = true
 enable_error_code = [
+    "deprecated",
     "exhaustive-match",
     "ignore-without-code",
     "mutable-override",
+    "possibly-undefined",
     "redundant-expr",
     "truthy-bool",
     "truthy-iterable",
diff --git a/tests/test_asyncio.py b/tests/test_asyncio.py
index 96560b07..c9d58027 100644
--- a/tests/test_asyncio.py
+++ b/tests/test_asyncio.py
@@ -85,7 +85,6 @@ async def test_retry(self) -> None:
 
     @asynctest
     async def test_iscoroutinefunction(self) -> None:
-        assert asyncio.iscoroutinefunction(_retryable_coroutine)
         assert inspect.iscoroutinefunction(_retryable_coroutine)
 
     @asynctest
diff --git a/tests/test_tenacity.py b/tests/test_tenacity.py
index 8cfd34e5..d5dd8f17 100644
--- a/tests/test_tenacity.py
+++ b/tests/test_tenacity.py
@@ -692,10 +692,9 @@ def waitfunc(retry_state: RetryCallState) -> float:
         def returnval() -> int:
             return 123
 
-        try:
+        with self.assertRaises(ExtractCallState) as caught:
             retrying(returnval)
-        except ExtractCallState as err:
-            retry_state = err.args[0]
+        retry_state = caught.exception.args[0]
         self.assertIs(retry_state.fn, returnval)
         self.assertEqual(retry_state.args, ())
         self.assertEqual(retry_state.kwargs, {})
@@ -706,10 +705,9 @@ def returnval() -> int:
         def dying() -> None:
             raise Exception("Broken")
 
-        try:
+        with self.assertRaises(ExtractCallState) as caught:
             retrying(dying)
-        except ExtractCallState as err:
-            retry_state = err.args[0]
+        retry_state = caught.exception.args[0]
         self.assertIs(retry_state.fn, dying)
         self.assertEqual(retry_state.args, ())
         self.assertEqual(retry_state.kwargs, {})