diff --git a/Dockerfile.ubuntu b/Dockerfile.ubuntu
index b8df616a5..8becea48c 100644
--- a/Dockerfile.ubuntu
+++ b/Dockerfile.ubuntu
@@ -1,7 +1,7 @@
 FROM ubuntu:22.04 as builder
 
 RUN apt-get update && apt-get install --fix-missing -y ca-certificates
-RUN sed -i "s@http://.*archive.ubuntu.com@https://mirrors.tuna.tsinghua.edu.cn@g" /etc/apt/sources.list && sed -i "s@http://.*security.ubuntu.com@https://mirrors.tuna.tsinghua.edu.cn@g" /etc/apt/sources.list
+RUN sed -i "s@http://.*archive.ubuntu.com@https://mirrors.pku.edu.cn@g" /etc/apt/sources.list && sed -i "s@http://.*security.ubuntu.com@https://mirrors.pku.edu.cn@g" /etc/apt/sources.list
 RUN apt-get update && apt-get upgrade -y
 RUN apt-get install -y cmake gcc g++ ninja-build
 ADD . /proxy