diff --git a/src/field/arena.ts b/src/field/arena.ts
index 5fe8b175e..681cb6587 100644
--- a/src/field/arena.ts
+++ b/src/field/arena.ts
@@ -257,7 +257,7 @@ export class Arena {
         return 0;
     }
 
-    return 83 / 132;
+    return 131 / 180;
   }
 
   trySetWeatherOverride(weather: WeatherType): boolean {