diff --git a/brew/Brewfile b/brew/Brewfile
index 6c4bcee..c283f62 100644
--- a/brew/Brewfile
+++ b/brew/Brewfile
@@ -5,6 +5,7 @@ tap "homebrew/cask-versions"
 tap "homebrew/core"
 tap "homebrew/services"
 tap "universal-ctags/universal-ctags"
+tap "yoheimuta/protolint"
 
 brew "coreutils"
 brew "dateutils"
@@ -29,6 +30,7 @@ brew "moreutils"
 brew "mosh"
 brew "neovim"
 brew "pipenv"
+brew "protolint"
 brew "python"
 brew "rbenv"
 brew "ripgrep"