diff --git a/brew/Brewfile b/brew/Brewfile
index e749c50..5a713a5 100644
--- a/brew/Brewfile
+++ b/brew/Brewfile
@@ -1,8 +1,6 @@
 tap "homebrew/bundle"
-tap "homebrew/cask"
 tap "homebrew/cask-fonts"
 tap "homebrew/cask-versions"
-tap "homebrew/core"
 tap "homebrew/services"
 tap "yoheimuta/protolint"