diff --git a/Jenkinsfile b/Jenkinsfile
index d6f2b49..73e4f3f 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -17,7 +17,7 @@ exceriseSets = [
 //    'ex101' : [3, 2],
 //    'ex201' : [2, 2, 5, 6],
 //    'ex301' : [2, 2, 5, 6],
-//    'ex401' : [6, 9]
+    'ex401' : [6, 9]
 ]
 
 pipeline {