diff --git a/.eslintrc b/.eslintrc
index da143a7..3c0dfe8 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,7 +1,7 @@
 root: true
 
 parserOptions:
-  ecmaVersion: 2017
+  ecmaVersion: 2015
 
 env:
   node: true