diff --git a/pom.xml b/pom.xml
index 8f2e24aa..dae3c910 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,7 +40,7 @@
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-all</artifactId>
-      <version>4.0.20.Final</version>
+      <version>4.0.21.Final</version>
       <scope>compile</scope>
     </dependency>
     <dependency>