diff --git a/tests/test_o3_pro_output_text_fix.py b/tests/test_o3_pro_output_text_fix.py
index b465425..2709305 100644
--- a/tests/test_o3_pro_output_text_fix.py
+++ b/tests/test_o3_pro_output_text_fix.py
@@ -41,6 +41,12 @@ class TestO3ProOutputTextFix:
         # Use the new public API for registry cleanup
         ModelProviderRegistry.reset_for_testing()
         # Provider registration is now handled by inject_transport helper
+        
+        # Clear restriction service to ensure it re-reads environment
+        # This is necessary because previous tests may have set restrictions
+        # that are cached in the singleton
+        import utils.model_restrictions
+        utils.model_restrictions._restriction_service = None
 
     def teardown_method(self):
         """Clean up after test to ensure no state pollution."""