diff --git a/Chapter09/realtime/pom.xml b/Chapter09/realtime/pom.xml
index 8a9b29d..a2ee35c 100644
--- a/Chapter09/realtime/pom.xml
+++ b/Chapter09/realtime/pom.xml
@@ -30,7 +30,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>3.8.1</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>