diff --git a/flutter_frontend_server/test/fixtures/.dart_tool/package_config.json b/flutter_frontend_server/test/fixtures/.dart_tool/package_config.json
index 3ef4faffb74ca..f3ad2e285852e 100644
--- a/flutter_frontend_server/test/fixtures/.dart_tool/package_config.json
+++ b/flutter_frontend_server/test/fixtures/.dart_tool/package_config.json
@@ -5,7 +5,7 @@
             "name": "flutter_frontend_fixtures",
             "rootUri": "../",
             "packageUri": "lib",
-            "languageVersion": "2.2"
+            "languageVersion": "2.12"
           }
     ]
 }