1 files changed, 1 insertions, 1 deletions
diff --git a/tests/federation/test_complexity.py b/tests/federation/test_complexity.py
index 8186b8ca01..701fa8379f 100644
--- a/tests/federation/test_complexity.py
+++ b/tests/federation/test_complexity.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from mock import Mock
+from unittest.mock import Mock
 
 from synapse.api.errors import Codes, SynapseError
 from synapse.rest import admin