diff --git a/backend/internal/server/api_contract_test.go b/backend/internal/server/api_contract_test.go
index 4cde2869..39869d4d 100644
--- a/backend/internal/server/api_contract_test.go
+++ b/backend/internal/server/api_contract_test.go
@@ -774,6 +774,7 @@ func TestAPIContracts(t *testing.T) {
 					"enable_cch_signing": false,
 					"enable_anthropic_cache_ttl_1h_injection": false,
 					"rewrite_message_cache_control": false,
+					"antigravity_user_agent_version": "",
 					"enable_fingerprint_unification": true,
 					"enable_metadata_passthrough": false,
 					"web_search_emulation_enabled": false,
@@ -990,6 +991,7 @@ func TestAPIContracts(t *testing.T) {
 					"enable_cch_signing": false,
 					"enable_anthropic_cache_ttl_1h_injection": false,
 					"rewrite_message_cache_control": false,
+					"antigravity_user_agent_version": "",
 					"web_search_emulation_enabled": false,
 					"payment_visible_method_alipay_source": "",
 					"payment_visible_method_wxpay_source": "",