diff --git a/.travis.yml b/.travis.yml
index 2d3fd99..4656d2e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,7 @@
 language: node_js
 node_js:
-  - "4.7.2"
-  - "6.9.4"
-  - "7.4.0"
+  - "4.7.3"
+  - "6.9.5"
+  - "7.5.0"
 script: "npm run-script test-coverage"
-# Send coverage data to Coveralls
 after_script: "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"
diff --git a/bin/migrate-mongo.js b/bin/migrate-mongo.js
index 85e5c78..ebf5c7c 100755
--- a/bin/migrate-mongo.js
+++ b/bin/migrate-mongo.js
@@ -1,17 +1,16 @@
 #! /usr/bin/env node
 
-var program = require('commander');
-var _ = require('lodash');
-var migrateMongo = require('../lib/migrate-mongo');
-var database = require('../lib/env/database');
-
-var Table = require('cli-table');
+const program = require('commander');
+const _ = require('lodash');
+const Table = require('cli-table');
+const migrateMongo = require('../lib/migrate-mongo');
+const database = require('../lib/env/database');
 
 program
   .command('init')
   .description('initialize a new migration project')
   .action(function () {
-    migrateMongo.init(function (err) {
+    migrateMongo.init((err) => {
       if (err) return handleError(err);
       console.log('Initialization successful. Please edit the generated config.js file');
     });
@@ -20,8 +19,8 @@ program
 program
   .command('create [description]')
   .description('create a new database migration with the provided description')
-  .action(function (description) {
-    migrateMongo.create(description, function (err, filename) {
+  .action((description) =>{
+    migrateMongo.create(description, (err, filename) => {
       if (err) return handleError(err);
       console.log('Created: migrations/' + filename);
     });
@@ -31,15 +30,12 @@ program
   .command('up')
   .description('run all unapplied database migrations')
   .option('-f --file <file>', 'use a custom config file')
-  .action(function (options) {
+  .action((options) =>{
     global.options = options;
-    database.connect(function (err, db) {
+    database.connect((err, db) => {
       if (err) return handleError(err);
-      migrateMongo.up(db, function (err, migrated) {
-        migrated.forEach(function (migratedItem) {
-          console.log('MIGRATED UP: ' + migratedItem);
-        });
-
+      migrateMongo.up(db, (err, migrated) => {
+        migrated.forEach((migratedItem) => console.log(`MIGRATED UP: ${migratedItem}`));
         if (err) return handleError(err);
         process.exit(0);
       });
@@ -50,15 +46,12 @@ program
   .command('down')
   .description('undo the last applied database migration')
   .option('-f --file <file>', 'use a custom config file')
-  .action(function (options) {
+  .action((options) => {
     global.options = options;
-    database.connect(function (err, db) {
+    database.connect((err, db) => {
       if (err) return handleError(err);
-      migrateMongo.down(db, function (err, migrated) {
-        migrated.forEach(function (migratedItem) {
-          console.log('MIGRATED DOWN: ' + migratedItem);
-        });
-
+      migrateMongo.down(db, (err, migrated) => {
+        migrated.forEach(migratedItem => console.log('MIGRATED DOWN: ' + migratedItem));
         if (err) return handleError(err);
         process.exit(0);
       });
@@ -69,11 +62,11 @@ program
   .command('status')
   .description('print the changelog of the database')
   .option('-f --file <file>', 'use a custom config file')
-  .action(function (options) {
+  .action((options) => {
     global.options = options;
-    database.connect(function (err, db) {
+    database.connect((err, db) => {
       if (err) return handleError(err);
-      migrateMongo.status(db, function (err, statusItems) {
+      migrateMongo.status(db, (err, statusItems) => {
         if (err) return handleError(err);
         printStatusTable(statusItems);
         process.exit(0);
@@ -93,9 +86,7 @@ function handleError(err) {
 }
 
 function printStatusTable(statusItems) {
-  var table = new Table({head: ['Filename', 'Applied At']});
-  statusItems.forEach(function (item) {
-    table.push(_.values(item));
-  });
+  const table = new Table({head: ['Filename', 'Applied At']});
+  statusItems.forEach(item => table.push(_.values(item)));
   console.log(table.toString());
 }
\ No newline at end of file
diff --git a/lib/actions/create.js b/lib/actions/create.js
index a1bba6f..048460b 100644
--- a/lib/actions/create.js
+++ b/lib/actions/create.js
@@ -12,7 +12,7 @@ module.exports = function (description, done) {
   async.waterfall([
     migrationsDir.shouldExist,
     (taskDone) => {
-      description = description.split(' ').join('_'); // replace spaces with underscores
+      description = description.split(' ').join('_');
       const source = path.join(__dirname, '../../samples/migration.js');
       const filename = moment.utc().format('YYYYMMDDHHmmss') + '-' + description + '.js';
       const destination = path.join(process.cwd(), 'migrations', filename);
diff --git a/lib/actions/down.js b/lib/actions/down.js
index 7fc175c..36e8531 100644
--- a/lib/actions/down.js
+++ b/lib/actions/down.js
@@ -37,8 +37,5 @@ module.exports = function (db, done) {
         });
       });
     }
-  ], function (err) {
-    if (err) return done(err, downgraded);
-    return done(null, downgraded);
-  });
+  ], (err) => done(err, downgraded));
 };
\ No newline at end of file
diff --git a/lib/actions/status.js b/lib/actions/status.js
index e039c38..8a2c338 100644
--- a/lib/actions/status.js
+++ b/lib/actions/status.js
@@ -23,7 +23,7 @@ module.exports = function (db, done) {
     function fetchContentOfChangeLog(next) {
       const collectionName = configFile.read().changelogCollectionName;
       const collection = db.collection(collectionName);
-      collection.find({}).toArray(function (err, docs) {
+      collection.find({}).toArray((err, docs) => {
         if (err) return next(err);
         context.changelog = docs;
         next();
@@ -33,7 +33,7 @@ module.exports = function (db, done) {
     if (err) return done(err);
     const statusTable = context.fileNames.map((fileName) => {
       const itemInLog = _.find(context.changelog, {fileName});
-      const appliedAt = (itemInLog) ? itemInLog.appliedAt.toJSON() : 'PENDING';
+      const appliedAt = itemInLog ? itemInLog.appliedAt.toJSON() : 'PENDING';
       return { fileName, appliedAt };
     });
     return done(null, statusTable);
diff --git a/lib/actions/up.js b/lib/actions/up.js
index 9874905..6251366 100644
--- a/lib/actions/up.js
+++ b/lib/actions/up.js
@@ -35,8 +35,5 @@ module.exports = function (db, done) {
         });
       }, next);
     }
-  ], (err) => {
-    if (err) return done(err, upgraded);
-    return done(null, upgraded);
-  });
+  ], (err) => done(err, upgraded));
 };
\ No newline at end of file