diff --git a/tests/integration/test_live_server.py b/tests/integration/test_live_server.py
index 0273b50..d4f23f3 100644
--- a/tests/integration/test_live_server.py
+++ b/tests/integration/test_live_server.py
@@ -3,6 +3,7 @@
 Skipped unless CYCLES_BASE_URL is set.
 """
 import os
+
 import pytest
 
 pytestmark = pytest.mark.skipif(
diff --git a/tests/test_contract.py b/tests/test_contract.py
index 284ccf2..54c7a5e 100644
--- a/tests/test_contract.py
+++ b/tests/test_contract.py
@@ -2,9 +2,8 @@
 
 from __future__ import annotations
 
-import pathlib
-
 import copy
+import pathlib
 
 import pytest
 import yaml
@@ -20,7 +19,7 @@
 # ---------------------------------------------------------------------------
 
 def _load_spec() -> dict:
-    with open(SPEC_PATH) as f:
+    with open(SPEC_PATH, encoding="utf-8") as f:
         return yaml.safe_load(f)