diff --git a/mqtt/subscriber/pom.xml b/mqtt/subscriber/pom.xml
index ac8f3fa..8e5df70 100644
--- a/mqtt/subscriber/pom.xml
+++ b/mqtt/subscriber/pom.xml
@@ -11,7 +11,7 @@
 
     <properties>
         <!-- The versions of ALL the libraries used by this project. -->
-        <junit.version>4.12</junit.version>
+        <junit.version>4.13.1</junit.version>
         <logback.classic.version>1.2.3</logback.classic.version>
         <paho.mqtt.version>1.2.0</paho.mqtt.version>
         <commons.cli.version>1.4</commons.cli.version>