diff --git a/Dockerfile b/Dockerfile
index 859983d..869ea76 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # 使用 Kotlin + JDK 的輕量化映像
-FROM gradle:9-jdk25-alpine-dev AS builder
+FROM gradle:9.5.1-jdk25 AS builder
 
 WORKDIR /app
 COPY . .