diff --git a/mooc-java-programming-i/part04-Part04_05.Whistle/pom.xml b/mooc-java-programming-i/part04-Part04_05.Whistle/pom.xml
index d4fce10..89c15a3 100644
--- a/mooc-java-programming-i/part04-Part04_05.Whistle/pom.xml
+++ b/mooc-java-programming-i/part04-Part04_05.Whistle/pom.xml
@@ -17,7 +17,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>