diff --git a/Formula/docker-swarm.rb b/Formula/docker-swarm.rb
index 5ee4ddd99f..1450ee3107 100644
--- a/Formula/docker-swarm.rb
+++ b/Formula/docker-swarm.rb
@@ -3,8 +3,8 @@ require "language/go"
 class DockerSwarm < Formula
   desc "Turn a pool of Docker hosts into a single, virtual host"
   homepage "https://github.com/docker/swarm"
-  url "https://github.com/docker/swarm/archive/v0.3.0.tar.gz"
-  sha256 "3db5f261483b87330743e16b340a2f76349e2dcca6b1dd85b9e1b1288d50af22"
+  url "https://github.com/docker/swarm/archive/v0.4.0.tar.gz"
+  sha256 "c3ee1a34ce86da4d31f652c871dfa120fc78d5cc835e391034d740e83b48f7a3"
 
   head "https://github.com/docker/swarm.git"