diff --git a/.rubocop.yml b/.rubocop.yml
index d4698e0..4f4a561 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -4,7 +4,8 @@ AllCops:
   NewCops: enable
   Exclude:
     - 'spec/fixtures/*'
-  TargetRubyVersion: 3
+  TargetRubyVersion: 3.3
+  SuggestExtensions: false
 
 # https://github.com/cookpad/global-style-guides/blob/main/.rubocop.ruby.yml