diff --git a/src/main/resources/application-prod.yml b/src/main/resources/application-prod.yml
index 5218386..eaf37a3 100644
--- a/src/main/resources/application-prod.yml
+++ b/src/main/resources/application-prod.yml
@@ -278,11 +278,11 @@ app:
 
     five-min-track:
       ttl-minutes: 75
-      max-size: 500000
+      max-size: 700000       # 500K→700K (실측 504K, 30% 여유)
 
     hourly-track:
       ttl-hours: 26
-      max-size: 780000
+      max-size: 1400000      # 780K→1.4M (실측 1.08M, 30% 여유, +1.5GB)
 
 # 일일 항적 데이터 인메모리 캐시
 cache:
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 48850e6..7852738 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -282,11 +282,11 @@ app:
 
     five-min-track:
       ttl-minutes: 75          # TTL 75분 (1시간 + 15분 여유)
-      max-size: 500000         # 30K MMSI × 15 버킷
+      max-size: 700000         # 실측 504K (190K MMSI × ~3 버킷), 30% 여유
 
     hourly-track:
       ttl-hours: 26            # TTL 26시간 (24시간 + 2시간 여유)
-      max-size: 780000         # 30K MMSI × 26시간
+      max-size: 1400000        # 실측 1.08M (190K MMSI × ~6 버킷), 30% 여유
 
   chnprmship:
     mmsi-resource-path: classpath:chnprmship-mmsi.txt