diff --git a/.ci/.ruby.yml b/.ci/.ruby.yml
index e66d453ea..dc4435bd7 100644
--- a/.ci/.ruby.yml
+++ b/.ci/.ruby.yml
@@ -1,4 +1,5 @@
 VERSION:
+  - ruby:3.4
   - ruby:3.1
   - ruby:3.0
   - ruby:2.7