diff --git a/mac/Brewfile b/mac/Brewfile
index 11bc615..d97448a 100644
--- a/mac/Brewfile
+++ b/mac/Brewfile
@@ -28,6 +28,7 @@ brew "gpatch"
 brew "gnupg"
 brew "gawk"
 brew "grep"
+brew "parallel"
 brew "less"
 brew "make"
 brew "rsync"