diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index d21cc31..3beda58 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -288,7 +288,7 @@ app:
 
     hourly-track:
       ttl-hours: 26            # TTL 26시간 (24시간 + 2시간 여유)
-      max-size: 3500000        # 1.4M→3.5M (실측 1.27M, 2.8배 여유)
+      max-size: 5000000        # 3.5M→5M (실측 3.5M 100% 도달, 추이 관찰 후 조정)
 
   chnprmship:
     mmsi-resource-path: classpath:chnprmship-mmsi.txt