diff --git a/logstash.gemspec b/logstash.gemspec
index c35228c33..171d99781 100644
--- a/logstash.gemspec
+++ b/logstash.gemspec
@@ -26,9 +26,8 @@ Gem::Specification.new do |gem|
 
   # Web dependencies
   gem.add_runtime_dependency "ftw", ["~> 0.0.39"] #(Apache 2.0 license)
-  gem.add_runtime_dependency "haml"               #(MIT license)
-  gem.add_runtime_dependency "sass"               #(MIT license)
   gem.add_runtime_dependency "mime-types"         #(GPL 2.0)
+  gem.add_runtime_dependency "rack"               # (MIT-style license)
 
   # Input/Output/Filter dependencies
   #TODO Can these be optional?