diff --git a/iblinter.rb b/iblinter.rb
index f81791f..9726899 100644
--- a/iblinter.rb
+++ b/iblinter.rb
@@ -2,12 +2,12 @@ class Iblinter < Formula
   desc "A linter tool for Interface Builder"
   homepage "https://github.com/IBDecodable/IBLinter"
   url "https://github.com/IBDecodable/IBLinter.git",
-      :tag => "0.4.20",
-      :revision => "4b518dafbd64a329374f285c5f27bc6c08be7a38"
+      :tag => "0.4.21",
+      :revision => "d2da7b9a7a21fe60e93fc33517f77631d27c4db4"
   head "https://github.com/IBDecodable/IBLinter.git"
 
   bottle do
-    root_url "https://github.com/IBDecodable/IBLinter/releases/download/0.4.20"
+    root_url "https://github.com/IBDecodable/IBLinter/releases/download/0.4.21"
     cellar :any_skip_relocation
     sha256 "bd17fde9063d89aca76923bc88a65fbff283b867b20c3a16dc078372df061f21" => :mojave
   end