diff --git a/Dockerfile b/Dockerfile
index 53fb47a..611e639 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,8 +7,6 @@ ADD --checksum=sha256:17455a06c816031cc2c66243c117cba48463cd6a3a3fdfac7275b4e9c4
 	https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu/${TOOLCHAIN_VERSION}/binrel/arm-gnu-toolchain-${TOOLCHAIN_VERSION}-x86_64-arm-none-eabi.tar.xz \
 	/opt/toolchain.tar.xz
 
-RUN sed -ie 's/deb.debian.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list
-
 RUN apt-get update
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential cmake xz-utils clang cppcheck clang-tidy