diff --git a/pom.xml b/pom.xml
index da5d6c702f..f0ee2b1754 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
-            <version>4.1.19.Final</version>
+            <version>4.1.21.Final</version>
             <scope>compile</scope>
         </dependency>
         <dependency>