diff --git a/.ruby-version b/.ruby-version
index d13e837c8e..7919852fe1 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-4.0.6
+4.0.9
diff --git a/Gemfile.lock b/Gemfile.lock
index c17b883073..385cd71fb3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -779,7 +779,7 @@ DEPENDENCIES
   yard
 
 RUBY VERSION
-  ruby 4.0.6
+  ruby 4.0.9
 
 BUNDLED WITH
   4.0.19