diff --git a/Machine-Backend/Dockerfile b/Machine-Backend/Dockerfile
index 6cb7db5..2ee780a 100644
--- a/Machine-Backend/Dockerfile
+++ b/Machine-Backend/Dockerfile
@@ -3,7 +3,7 @@ FROM python:3.10-alpine
 WORKDIR /app
 
 # Use a faster mirror + install dependencies
-RUN sed -i 's/dl-cdn.alpinelinux.org/mirror.kakao.com/mirror.kakao.com/g' /etc/apk/repositories \
+RUN sed -i 's|dl-cdn.alpinelinux.org|mirror.kakao.com|g' /etc/apk/repositories \
     && apk add --no-cache gcc musl-dev python3-dev mariadb-dev libffi-dev openssl-dev
 
 # Copy requirements and install
@@ -22,4 +22,4 @@ ENV FLASK_RUN_PORT=5000
 EXPOSE 5000
 
 # Use Gunicorn
-CMD ["gunicorn", "--bind", "0.0.0.0:5000", "run:app"]
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "run:app"]
\ No newline at end of file