diff --git a/.rubocop.yml b/.rubocop.yml
index 6c5cba1..02d49ba 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.1
   Exclude:
     - _site/**/*
     - vendor/**/*