diff --git a/Gemfile b/Gemfile
index f9a2f5df..d481685a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,4 @@
 # encoding: utf-8
 # frozen_string_literal: true
 source "https://rubygems.org"
+ruby "3.1.4"
diff --git a/Gemfile.lock b/Gemfile.lock
index 61ffeb80..99671f60 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,3 +3,6 @@ GEM
 
 PLATFORMS
   ruby
+
+RUBY VERSION
+ ruby 3.1.4