diff --git a/src/main/java/hae/cache/MessageCache.java b/src/main/java/hae/cache/MessageCache.java
index 0efa7db..fe1162e 100644
--- a/src/main/java/hae/cache/MessageCache.java
+++ b/src/main/java/hae/cache/MessageCache.java
@@ -4,10 +4,16 @@ import com.github.benmanes.caffeine.cache.Cache;
 import com.github.benmanes.caffeine.cache.Caffeine;
 
 import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 public class MessageCache {
+    private static final int MAX_SIZE = 100000;
+    private static final int EXPIRE_DURATION = 12;
+
     private static final Cache<String, Map<String, Map<String, Object>>> cache =
             Caffeine.newBuilder()
+                    .maximumSize(MAX_SIZE)
+                    .expireAfterWrite(EXPIRE_DURATION, TimeUnit.HOURS)
                     .build();
 
     public static void put(String key, Map<String, Map<String, Object>> value) {