diff --git a/netty_demo/pom.xml b/netty_demo/pom.xml
index 088d74a..78a98b3 100644
--- a/netty_demo/pom.xml
+++ b/netty_demo/pom.xml
@@ -22,7 +22,7 @@
     <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 -->