diff --git a/middleman.gemspec b/middleman.gemspec
index 3f67abdc..b8c9edd1 100755
--- a/middleman.gemspec
+++ b/middleman.gemspec
@@ -5,7 +5,7 @@
 
 Gem::Specification.new do |s|
   s.name = %q{middleman}
-  s.version = "0.12.0.pre2"
+  s.version = "0.12.0.pre3"
 
   s.required_rubygems_version = Gem::Requirement.new("> 1.3.1") if s.respond_to? :required_rubygems_version=
   s.authors = ["Thomas Reynolds"]
@@ -1682,15 +1682,18 @@ Gem::Specification.new do |s|
     s.specification_version = 3
 
     if Gem::Version.new(Gem::RubyGemsVersion) >= Gem::Version.new('1.2.0') then
+      s.add_runtime_dependency(%q<rack>, [">= 0"])
       s.add_runtime_dependency(%q<thin>, [">= 0"])
       s.add_development_dependency(%q<rspec>, [">= 0"])
       s.add_development_dependency(%q<cucumber>, [">= 0"])
     else
+      s.add_dependency(%q<rack>, [">= 0"])
       s.add_dependency(%q<thin>, [">= 0"])
       s.add_dependency(%q<rspec>, [">= 0"])
       s.add_dependency(%q<cucumber>, [">= 0"])
     end
   else
+    s.add_dependency(%q<rack>, [">= 0"])
     s.add_dependency(%q<thin>, [">= 0"])
     s.add_dependency(%q<rspec>, [">= 0"])
     s.add_dependency(%q<cucumber>, [">= 0"])