diff --git a/Dockerfile b/Dockerfile
index 064e5da..5e82e7f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM cimg/ruby:2.7.5
+FROM cimg/ruby:3.0.5
 
 LABEL maintainer="dev@icare.jpn.com"