diff --git a/brew.sh b/brew.sh
index 2f8a7136f..6c5e3f26d 100755
--- a/brew.sh
+++ b/brew.sh
@@ -19,7 +19,7 @@ fi
 brew update
 
 # Upgrade any already-installed formulae.
-brew upgrade --all
+brew upgrade
 
 # Install GNU core utilities (those that come with OS X are outdated).
 # Don’t forget to add `$(brew --prefix coreutils)/libexec/gnubin` to `$PATH`.