diff --git a/distributed system/tomcat/pom.xml b/distributed system/tomcat/pom.xml
index 802fd39..f576eac 100644
--- a/distributed system/tomcat/pom.xml	
+++ b/distributed system/tomcat/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>
   </dependencies>