diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 394e524..c6540e9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,4 +26,4 @@ jobs:
       - name: Test
         run: uv run pytest --cov=flameconnect --cov-report=term-missing --tb=short
       - name: Mutation test
-        run: uv run mutmut run --max-children 2
+        run: uv run mutmut run --max-children 4
diff --git a/setup.cfg b/setup.cfg
index 21df9b8..45d47ce 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,8 @@
 [mutmut]
-paths_to_mutate =
-    src/flameconnect/protocol.py
-    src/flameconnect/client.py
-    src/flameconnect/auth.py
-    src/flameconnect/b2c_login.py
+paths_to_mutate = src/flameconnect
 also_copy = src
+do_not_mutate =
+    */__init__.py
+    src/flameconnect/const.py
+    src/flameconnect/exceptions.py
+max_stack_depth = 8
diff --git a/tests/test_cli_commands.py b/tests/test_cli_commands.py
index dba5ff5..24b41ed 100644
--- a/tests/test_cli_commands.py
+++ b/tests/test_cli_commands.py
@@ -1443,7 +1443,6 @@ async def test_tui_import_error(self, capsys):
 
         with (
             patch.dict("sys.modules", {"flameconnect.tui": None}),
-            patch("builtins.__import__", side_effect=ImportError("no tui")),
             pytest.raises(SystemExit),
         ):
             await cmd_tui()