diff --git a/lock-demo/pom.xml b/lock-demo/pom.xml
index 6aba479..912c431 100644
--- a/lock-demo/pom.xml
+++ b/lock-demo/pom.xml
@@ -73,7 +73,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
     </dependencies>