diff --git a/provisioning/roles/ruby/tasks/main.yml b/provisioning/roles/ruby/tasks/main.yml
index cc39092a2..ff2e31094 100644
--- a/provisioning/roles/ruby/tasks/main.yml
+++ b/provisioning/roles/ruby/tasks/main.yml
@@ -32,11 +32,11 @@
 - name: Install Ruby
   become: yes
   become_user: isucon
-  when: ruby_version_output is failed or ruby_version_output.stdout != "3.3.6"
+  when: ruby_version_output is failed or ruby_version_output.stdout != "3.4.1"
   args:
     chdir: /home/isucon
   command: |
-    /home/isucon/xbuild/ruby-install 3.3.6 /home/isucon/local/ruby
+    /home/isucon/xbuild/ruby-install 3.4.1 /home/isucon/local/ruby
 
 - name: Add PATH for ruby
   become: yes