diff --git a/swarmlab-app/src/run/app.js b/swarmlab-app/src/run/app.js
index a91a6a7..c64fc09 100755
--- a/swarmlab-app/src/run/app.js
+++ b/swarmlab-app/src/run/app.js
@@ -397,7 +397,10 @@ function onCollection(err, collection) {
 
 
 var mongourl = "mongodb://playgrounduser:efvvnuioervefSDFSGYGHRDFVsdfergvssppiiedifhwincvinviw_dbfjbsifbsdkjfswuunscfudfgbbfvibqefwrvnine@ondemand_playground_mongo1:27017,ondemand_playground_mongo2:27017,ondemand_playground_mongo3:27017,ondemand_playground_mongo4:27017,ondemand_playground_mongo5:27017,ondemand_playground_mongo6:27017,ondemand_playground_mongo7:27017/fluent?replicaSet=rs1"
-const OPTS = { useNewUrlParser: true };
+const OPTS = { 
+  useNewUrlParser: true, 
+  useUnifiedTopology: true
+};
 //var mongolab_uri = "mongodb://<dbUser>:<dbPassword>@<host1>:<port1>,<host2>:<port2>/<dbName>?replicaSet=<replicaSetName>";
 var mongooptions = {
             autoReconnect: true,