diff --git a/tutorial/timers/pingpong/pom.xml b/tutorial/timers/pingpong/pom.xml
index 728bb05..2fb4660 100644
--- a/tutorial/timers/pingpong/pom.xml
+++ b/tutorial/timers/pingpong/pom.xml
@@ -35,7 +35,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.2.3</version>
+            <version>1.2.13</version>
             <scope>compile</scope>
         </dependency>
     </dependencies>