diff --git a/CHANGES_NEXT_RELEASE b/CHANGES_NEXT_RELEASE
index 9837acc..4d8864c 100644
--- a/CHANGES_NEXT_RELEASE
+++ b/CHANGES_NEXT_RELEASE
@@ -1,3 +1,4 @@
 - Fix: replace git:// to https:// url for npm dependences
 - Fix: Dockerfile to include initial packages upgrade
+- Upgrade mongodb dev dep from 3.5.9 to 4.7.0
 - Upgrade NodeJS version from 14-slim to 16-slim in Dockerfile
diff --git a/package.json b/package.json
index 4957edb..a4917f1 100644
--- a/package.json
+++ b/package.json
@@ -62,7 +62,7 @@
     "husky": "~4.2.5",
     "lint-staged": "~10.2.11",
     "mocha": "8.0.1",
-    "mongodb": "3.5.9",
+    "mongodb": "4.7.0",
     "nock": "13.0.3",
     "nyc": "~15.1.0",
     "prettier": "~2.0.5",
diff --git a/test/unit/mongoDBUtils.js b/test/unit/mongoDBUtils.js
index e5f7fd8..fa2c2fd 100644
--- a/test/unit/mongoDBUtils.js
+++ b/test/unit/mongoDBUtils.js
@@ -30,39 +30,34 @@ function cleanDb(host, name, callback) {
     // FIXME: this code doesn't work with MongoDB replica set, we are assuming that an
     // standalone MongoDB instance is used to run unit test.To use a replica set this
     // needs to be adapted
+    // FIXME: not sure if the statement above is still valid after moving to mongodb 4.x.
+    // Maybe the limitation has been overpassed
     const url = 'mongodb://' + host + ':27017/' + name;
-    MongoClient.connect(
-        url,
-        {
-            useNewUrlParser: true,
-            connectTimeoutMS: 500
-        },
-        function(err, db) {
-            if (db) {
-                const collections = ['devices', 'groups', 'entities', 'registrations'];
+    MongoClient.connect(url, function (err, db) {
+        if (db) {
+            const collections = ['devices', 'groups', 'entities', 'registrations'];
 
-                async.eachSeries(
-                    collections,
-                    function(collection, innerCb) {
-                        const collectionDB = db.db(name).collection(collection);
-                        if (collectionDB) {
-                            collectionDB.drop(function(err, delOK) {
-                                innerCb();
-                            });
-                        } else {
+            async.eachSeries(
+                collections,
+                function (collection, innerCb) {
+                    const collectionDB = db.db(name).collection(collection);
+                    if (collectionDB) {
+                        collectionDB.drop(function (err, delOK) {
                             innerCb();
-                        }
-                    },
-                    function(err) {
-                        db.close();
-                        callback();
+                        });
+                    } else {
+                        innerCb();
                     }
-                );
-            } else {
-                callback();
-            }
+                },
+                function (err) {
+                    db.close();
+                    callback();
+                }
+            );
+        } else {
+            callback();
         }
-    );
+    });
 }
 
 function cleanDbs(host, callback) {