diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index 03a6e07307..79a7aa74f5 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -121,7 +121,7 @@ GEM
       rubocop-ast (>= 1.8.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.8.0)
+    rubocop-ast (1.9.0)
       parser (>= 3.0.1.1)
     rubocop-performance (1.11.4)
       rubocop (>= 1.7.0, < 2.0)