diff --git a/pom.xml b/pom.xml
index eaf489f5f3123bd2d1f5ee551874216fab26f765..6a5f6b529c905860eec38317db6e32cfeb4f031e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -125,21 +125,21 @@
test
-
org.slf4j
slf4j-api
1.7.5
+
com.fasterxml.jackson.core
jackson-core
- 2.3.0
+ 2.3.1
com.fasterxml.jackson.core
jackson-databind
- 2.3.0
+ 2.3.1
diff --git a/src/main/java/org/redisson/Redisson.java b/src/main/java/org/redisson/Redisson.java
index b9763e59f4f7a9a556c11ee9046ba7ad86d67921..369e89d6a4f4d855fc17631e766bb5e2afcde71b 100644
--- a/src/main/java/org/redisson/Redisson.java
+++ b/src/main/java/org/redisson/Redisson.java
@@ -17,7 +17,6 @@ package org.redisson;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.locks.Lock;
import org.redisson.core.RAtomicLong;
import org.redisson.core.RCountDownLatch;
@@ -140,7 +139,7 @@ public class Redisson {
RedissonTopic topic = topicsMap.get(name);
if (topic == null) {
RedisConnection