diff --git a/concurrency/pom.xml b/concurrency/pom.xml
index 016e004..4b21535 100644
--- a/concurrency/pom.xml
+++ b/concurrency/pom.xml
@@ -17,7 +17,7 @@
     <dependency>
       <groupId>com.typesafe.akka</groupId>
       <artifactId>akka-actor_2.11</artifactId>
-      <version>2.4.1</version>
+      <version>2.4.17</version>
     </dependency>
    </dependencies>
 </project>