diff --git a/makefile b/makefile
index cf36d67..93b97ee 100644
--- a/makefile
+++ b/makefile
@@ -4,8 +4,8 @@
 ## init
 init:
 	brew install rbenv ruby-build
-	rbenv install 2.7.6
-	rbenv shell 2.7.6
+	rbenv install 3.1.0
+	rbenv shell 3.1.0
 	rbenv exec gem install contracts -v 0.16.1
 	rbenv exec gem install middleman
 	rbenv exec bundle install
@@ -52,4 +52,4 @@ help:
 		} \
 		printf "\n"; \
 	}' \
-	| more $(shell test $(shell uname) = Darwin && echo '--no-init --raw-control-chars')
\ No newline at end of file
+	| more $(shell test $(shell uname) = Darwin && echo '--no-init --raw-control-chars')