diff --git a/.ruby-version b/.ruby-version
index 7636e756..7919852f 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-4.0.5
+4.0.9
diff --git a/Gemfile b/Gemfile
index ca96b8c0..556804f3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source "https://rubygems.org"
-ruby "4.0.5"
+ruby "4.0.9"
 
 gem "rails"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index c082df14..fb2c30f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -617,7 +617,7 @@ DEPENDENCIES
   yabeda-rails
 
 RUBY VERSION
-  ruby 4.0.5
+  ruby 4.0.9
 
 BUNDLED WITH
   4.0.3