diff --git a/Gemfile b/Gemfile
index 6d3847ad5954159f555db5fb18f4a49e0b3ef85b..8ed322b77db97f53d603c15c5d2a61b065f2595b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-source 'https://rubygems.org'
+source 'https://mirrors.tuna.tsinghua.edu.cn/rubygems/'
 
 if ENV.fetch('BUNDLER_CHECKSUM_VERIFICATION_OPT_IN', 'false') != 'false' # this verification is still experimental
   $LOAD_PATH.unshift(File.expand_path("vendor/gems/bundler-checksum/lib", __dir__))