diff --git a/Courses/12. Test Driven Development/Exercise/Skeleton/Chainblock/pom.xml b/Courses/12. Test Driven Development/Exercise/Skeleton/Chainblock/pom.xml
index 6628244..8ab9be9 100644
--- a/Courses/12. Test Driven Development/Exercise/Skeleton/Chainblock/pom.xml	
+++ b/Courses/12. Test Driven Development/Exercise/Skeleton/Chainblock/pom.xml	
@@ -25,7 +25,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.mockito/mockito-core -->