diff --git a/sa-token-plugin/sa-token-redisson-jackson2/src/main/java/cn/dev33/satoken/dao/SaTokenDaoRedissonJackson.java b/sa-token-plugin/sa-token-redisson-jackson2/src/main/java/cn/dev33/satoken/dao/SaTokenDaoRedissonJackson.java
index 3698c6f8..fa98f61c 100644
--- a/sa-token-plugin/sa-token-redisson-jackson2/src/main/java/cn/dev33/satoken/dao/SaTokenDaoRedissonJackson.java
+++ b/sa-token-plugin/sa-token-redisson-jackson2/src/main/java/cn/dev33/satoken/dao/SaTokenDaoRedissonJackson.java
@@ -71,7 +71,7 @@ public class SaTokenDaoRedissonJackson implements SaTokenDao {
 	 * 	</pre>
 	 * </p>
 	 */
-	public ObjectMapper objectMapper;
+	public final ObjectMapper objectMapper;
 
 	/**
 	 * 序列化方式