diff --git a/.rubocop.yml b/.rubocop.yml
index bec2464c74025c969ca8fd31c0049471449f312c..13df3f996139ac85da048dd76d0736a04494154f 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -5,7 +5,7 @@ require:
 inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.1
   # Cop names are not d§splayed in offense messages by default. Change behavior
   # by overriding DisplayCopNames, or by giving the -D/--display-cop-names
   # option.