diff --git a/docker/tool/linux/Dockerfile.base b/docker/tool/linux/Dockerfile.base
index 46e7af97..c18b1c12 100644
--- a/docker/tool/linux/Dockerfile.base
+++ b/docker/tool/linux/Dockerfile.base
@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM mcr.microsoft.com/mirror/docker/library/ubuntu:20.04
 ENV DEBIAN_FRONTEND noninteractive
 ENV DOTNETCORESDK_VERSION 2.1
 ENV DOCKER_COMPOSE_VERSION 1.22.0
diff --git a/docker/tool/windows/Dockerfile.base b/docker/tool/windows/Dockerfile.base
index 12c3f634..f51cc0e1 100644
--- a/docker/tool/windows/Dockerfile.base
+++ b/docker/tool/windows/Dockerfile.base
@@ -1,4 +1,4 @@
-FROM microsoft/windowsservercore:1709 AS base
+FROM mcr.microsoft.com/windows/servercore:1709 AS base
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
 ARG PYTHON2_VERSION
 ARG PYTHON3_VERSION