diff --git a/pygitweb/merge_requests_test.py b/pygitweb/merge_requests_test.py
index 455bba6..27ab4e8 100644
--- a/pygitweb/merge_requests_test.py
+++ b/pygitweb/merge_requests_test.py
@@ -34,7 +34,7 @@ class TestMergeRequestTagView:
 		_a, b = _commit_chain(repo)
 		mr = MergeRequest(
 			b,
-			repo.default_signature,
+			pygit2.Signature("tester", "tester@example.com"),
 			ours="refs/heads/main",
 			title="Feature MR",
 			description="Desc line",
diff --git a/pygitweb/mr_permissions_test.py b/pygitweb/mr_permissions_test.py
index 4292f2a..84a8201 100644
--- a/pygitweb/mr_permissions_test.py
+++ b/pygitweb/mr_permissions_test.py
@@ -56,7 +56,7 @@ def mr_env(tmp_path: Path) -> Generator[dict[str, str], None, None]:
 	_a, b = _commit_chain(repo)
 	mr = MergeRequest(
 		b,
-		repo.default_signature,
+		pygit2.Signature("tester", "tester@example.com"),
 		ours="refs/heads/main",
 		title="Feature MR",
 		name=f"{MR_REF_PREFIX}aaaabbbbccccdddd",