diff --git a/Library/.rubocop_shared.yml b/Library/.rubocop_shared.yml
index 96f1589029..d3e4f49bde 100644
--- a/Library/.rubocop_shared.yml
+++ b/Library/.rubocop_shared.yml
@@ -3,7 +3,7 @@
 require: ./Homebrew/rubocops.rb
 
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.6
   DisplayCopNames: false
 
 # Use `<<~` for heredocs.