diff --git a/tests/unit/util/test_configuration.py b/tests/unit/util/test_configuration.py
index 11c1ece8b..4a027b339 100644
--- a/tests/unit/util/test_configuration.py
+++ b/tests/unit/util/test_configuration.py
@@ -10,7 +10,6 @@
 import pytest
 import responses
 from attrs import asdict
-from attrs.exceptions import FrozenInstanceError
 from requests.exceptions import HTTPError
 from ruamel.yaml.scanner import ScannerError