diff --git a/12-opt-out-of-ab-tests/java/pom.xml b/12-opt-out-of-ab-tests/java/pom.xml
index 432b3bd9..e97b1e8b 100644
--- a/12-opt-out-of-ab-tests/java/pom.xml
+++ b/12-opt-out-of-ab-tests/java/pom.xml
@@ -8,7 +8,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
         </dependency>
 
         <dependency>