diff --git a/middleman-more/middleman-more.gemspec b/middleman-more/middleman-more.gemspec
index 0a230414..f69e2f79 100644
--- a/middleman-more/middleman-more.gemspec
+++ b/middleman-more/middleman-more.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency("middleman-core", Middleman::VERSION)
   s.add_dependency("uglifier", ["~> 1.2.6"])
-  s.add_dependency("haml", [">= 3.1.6", "< 4.0.0"])
+  s.add_dependency("haml", [">= 3.1.6"])
   s.add_dependency("sass", [">= 3.1.20"])
   s.add_dependency("compass", [">= 0.12.2"])
   s.add_dependency("coffee-script", ["~> 2.2.0"])