diff --git a/docs/dockerfile.md b/docs/dockerfile.md
index e538e24..08c41bf 100644
--- a/docs/dockerfile.md
+++ b/docs/dockerfile.md
@@ -28,7 +28,7 @@ FROM [--platform=<platform>] <image> [AS <name>]
 示例
 
 ```dockerfile
-FROM ruby:2.2.2
+FROM ruby:3.2.2
 FROM golang:1.19-alpine3.16 AS build-env
 ```