diff --git a/tests/test_migrate.py b/tests/test_migrate.py
index f1b43d9..7dfeb86 100644
--- a/tests/test_migrate.py
+++ b/tests/test_migrate.py
@@ -648,7 +648,7 @@ def test_real_cli_success_and_failure_envelopes_without_a_shell(self) -> None:
                 (
                     "extension",
                     "SANKA_EXTENSION_NOT_FOUND",
-                    lambda: migrate.extensions.add("sanka/drf-to-fastapi"),
+                    lambda: migrate.extensions.add("sanka-sdk-test/does-not-exist"),
                 ),
                 (
                     "plan",