diff --git a/tests/base_test.py b/tests/base_test.py
index f503345..d98f05b 100644
--- a/tests/base_test.py
+++ b/tests/base_test.py
@@ -26,7 +26,7 @@ class TestBase:
 
     def teardown_class(self):
         """ Teardown class level resources or configurations """
-        pass
+        os.environ["ENVIRON"] = self.old_env
 
     @pytest.fixture(scope="class")
     def test_client(self) -> FlaskClient: