diff --git a/.ruby-version b/.ruby-version
index 25e8632..7919852 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.12
+4.0.9
diff --git a/mise.toml b/mise.toml
index c71cdd4..fca38df 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,2 +1,2 @@
 [tools]
-ruby = "3.4.12"
+ruby = "4.0.9"