diff --git a/netty-demo/pom.xml b/netty-demo/pom.xml
index 2cd5716..237ff16 100644
--- a/netty-demo/pom.xml
+++ b/netty-demo/pom.xml
@@ -25,7 +25,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.11</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
         <!-- https://mvnrepository.com/artifact/io.netty/netty-all -->