diff --git a/.ruby-version b/.ruby-version
index 75a22a2..fd2a018 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.0.3
+3.1.0
diff --git a/Gemfile b/Gemfile
index 48496a3..3cd6536 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,6 +58,7 @@ gem 'devise'
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri mingw x64_mingw ]
+  gem "standard"
 end
 
 group :development do