diff --git a/pyproject.toml b/pyproject.toml
index a6e17eada..6b41c1ae3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -143,6 +143,9 @@ python-version = "3.10"
 # Some code uses `# ty: ignore[invalid-argument-type]` for this limitation.
 # TODO: Remove these ignores once ty supports union narrowing
 
+[tool.ty.terminal]
+error-on-warning = true
+
 [tool.ruff.lint]
 fixable = ["ALL"]
 ignore = [
diff --git a/tests/server/auth/providers/test_supabase.py b/tests/server/auth/providers/test_supabase.py
index 70c21085f..5182ca5e5 100644
--- a/tests/server/auth/providers/test_supabase.py
+++ b/tests/server/auth/providers/test_supabase.py
@@ -135,10 +135,11 @@ class TestSupabaseProvider:
         )
 
         assert provider.auth_route == "custom/auth/route"
+        assert isinstance(provider.token_verifier, JWTVerifier)
         assert (
             provider.token_verifier.jwks_uri
             == "https://abc123.supabase.co/custom/auth/route/.well-known/jwks.json"
-        )  # type: ignore[attr-defined]
+        )
 
     def test_custom_auth_route_trailing_slash(self):
         provider = SupabaseProvider(