diff --git a/.ruby-version b/.ruby-version
index d13e837c8..7919852fe 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-4.0.6
+4.0.9
diff --git a/Gemfile.lock b/Gemfile.lock
index 857666c85..7a3e18ffd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -965,7 +965,7 @@ CHECKSUMS
   zeitwerk (2.8.3) sha256=2c85125a8467ce069e20123d1e709a08955c9d29c118c25b46b7b7fafdbb92e5
 
 RUBY VERSION
-  ruby 4.0.6
+  ruby 4.0.9
 
 BUNDLED WITH
   4.0.15