diff --git a/Dockerfile b/Dockerfile
index ccb7156..5625030 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 # 安裝必要的工具
-RUN apk add --no-cache --no-check-certificate bash curl coreutils
+RUN apk add --no-cache --no-check-certificate bash curl
     
 COPY entrypoint.sh /entrypoint.sh
 
diff --git a/entrypoint.sh b/entrypoint.sh
index 7e3b8a5..50ab077 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -28,8 +28,8 @@ while true; do
 		break
 	fi
 
-    # 休息 60 秒後重試
-	/usr/bin/sleep 60
+    # 使用 bash 內建等待 60 秒，避免 sleep 指令不存在
+	read -r -t 60 _ < /dev/null || true
 done
 
 # 將狀態碼輸出到環境變數