diff --git a/middleman/middleman.gemspec b/middleman/middleman.gemspec
index ed0acc6f..4533da21 100644
--- a/middleman/middleman.gemspec
+++ b/middleman/middleman.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.add_dependency('middleman-core', Middleman::VERSION)
   s.add_dependency('middleman-cli', Middleman::VERSION)
   s.add_dependency('middleman-sprockets', '>= 3.4.0')
-  s.add_dependency('middleman-compass', '4.0.0.alpha.3')
+  s.add_dependency('middleman-compass', '>= 4.0.0.alpha.3')
   s.add_dependency('sass', ['>= 3.4.0', '< 4.0'])
   s.add_dependency('compass-import-once', ['1.0.5'])
   s.add_dependency('haml', ['>= 4.0.5'])