diff --git a/tests/conftest.py b/tests/conftest.py
index 5b216db..59cb5dd 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -35,6 +35,7 @@ def app(tmp_path: Path):
     flask_app = create_api_app(
         {
             "TESTING": True,
+            "SECRET_KEY": "testing",
             "STORAGE_ROOT": storage_root,
             "IAM_CONFIG": iam_config,
             "BUCKET_POLICY_PATH": bucket_policies,
diff --git a/tests/test_kms_api.py b/tests/test_kms_api.py
index d52dda0..97429c8 100644
--- a/tests/test_kms_api.py
+++ b/tests/test_kms_api.py
@@ -15,6 +15,7 @@ def kms_client(tmp_path):
     
     app = create_app({
         "TESTING": True,
+        "SECRET_KEY": "testing",
         "STORAGE_ROOT": str(tmp_path / "storage"),
         "IAM_CONFIG": str(tmp_path / "iam.json"),
         "BUCKET_POLICY_PATH": str(tmp_path / "policies.json"),
diff --git a/tests/test_ui_pagination.py b/tests/test_ui_pagination.py
index 5d5bee0..e6f34d1 100644
--- a/tests/test_ui_pagination.py
+++ b/tests/test_ui_pagination.py
@@ -28,6 +28,7 @@ def _make_app(tmp_path: Path):
     flask_app = create_app(
         {
             "TESTING": True,
+            "SECRET_KEY": "testing",
             "WTF_CSRF_ENABLED": False,
             "STORAGE_ROOT": storage_root,
             "IAM_CONFIG": iam_config,