diff --git a/src/helpers/create_index.js b/src/helpers/create_index.js
index acf1b0f..959ab51 100644
--- a/src/helpers/create_index.js
+++ b/src/helpers/create_index.js
@@ -1,4 +1,4 @@
-var schema = {
+const schema = {
   payload: { type: 'object', enabled: false },
   priority: { type: 'short' },
   timeout: { type: 'long' },
diff --git a/src/index.js b/src/index.js
index 18bf795..76f9b37 100644
--- a/src/index.js
+++ b/src/index.js
@@ -25,7 +25,7 @@ export default class Esqueue extends events.EventEmitter {
   }
 
   _initTasks() {
-    var initTasks = [
+    const initTasks = [
       this.client.ping({ timeout: 3000 }),
     ];
 
diff --git a/test/fixtures/elasticsearch.js b/test/fixtures/elasticsearch.js
index 620bb00..f32c9ae 100644
--- a/test/fixtures/elasticsearch.js
+++ b/test/fixtures/elasticsearch.js
@@ -11,7 +11,7 @@ function Client() {
 }
 
 Client.prototype.index = function (params = {}) {
-  var shardCount = 2;
+  const shardCount = 2;
   return Promise.resolve({
     _index: params.index || 'index',
     _type: params.type || 'type',
@@ -83,7 +83,7 @@ Client.prototype.search = function (params = {}, count = 5, source = {}) {
 };
 
 Client.prototype.update = function (params = {}) {
-  var shardCount = 2;
+  const shardCount = 2;
   return Promise.resolve({
     _index: params.index || 'index',
     _type: params.type || 'type',
diff --git a/test/src/helpers/index_timestamp.js b/test/src/helpers/index_timestamp.js
index 7f1a24b..01c92c4 100644
--- a/test/src/helpers/index_timestamp.js
+++ b/test/src/helpers/index_timestamp.js
@@ -25,32 +25,32 @@ describe('Index interval', function () {
     });
 
     it('should return the year', function () {
-      var timestamp = indexTimestamp('year');
+      const timestamp = indexTimestamp('year');
       expect(timestamp).to.equal('2016');
     });
 
     it('should return the year and month', function () {
-      var timestamp = indexTimestamp('month');
+      const timestamp = indexTimestamp('month');
       expect(timestamp).to.equal('2016-04');
     });
 
     it('should return the year, month, and first day of the week', function () {
-      var timestamp = indexTimestamp('week');
+      const timestamp = indexTimestamp('week');
       expect(timestamp).to.equal('2016-03-27');
     });
 
     it('should return the year, month, and day of the week', function () {
-      var timestamp = indexTimestamp('day');
+      const timestamp = indexTimestamp('day');
       expect(timestamp).to.equal('2016-04-02');
     });
 
     it('should return the year, month, day and hour', function () {
-      var timestamp = indexTimestamp('hour');
+      const timestamp = indexTimestamp('hour');
       expect(timestamp).to.equal('2016-04-02-01');
     });
 
     it('should return the year, month, day, hour and minute', function () {
-      var timestamp = indexTimestamp('minute');
+      const timestamp = indexTimestamp('minute');
       expect(timestamp).to.equal('2016-04-02-01-02');
     });
   });