diff --git a/ci_scripts/ci_post_clone.sh b/ci_scripts/ci_post_clone.sh
index ee67ff0b5..75605f7b7 100755
--- a/ci_scripts/ci_post_clone.sh
+++ b/ci_scripts/ci_post_clone.sh
@@ -14,7 +14,11 @@ echo $PWD
 
 # install ruby from homebrew
 brew install ruby
+echo 'export PATH="/Users/local/Homebrew/opt/ruby/bin:$PATH"' >> ~/.zshrc
+source ~/.zshrc
+
 ruby --version
+which gem
 
 # workaround default installation location cannot access without sudo problem
 echo 'export GEM_HOME=$HOME/gems' >>~/.bash_profile