diff --git a/middleman.gemspec b/middleman.gemspec
index f84f38a0..cd8311a6 100644
--- a/middleman.gemspec
+++ b/middleman.gemspec
@@ -27,9 +27,9 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency("padrino-helpers", ["~> 0.9.23"])
   s.add_runtime_dependency("rack-test", ["~> 0.5.0"])
   s.add_runtime_dependency("uglifier", ["~> 0.5.0"])
-  s.add_runtime_dependency("slim", ["~> 0.9.4"])
+  s.add_runtime_dependency("slim", ["~> 1.0.0"])
   s.add_runtime_dependency("haml", ["~> 3.1.0"])
-  s.add_runtime_dependency("sass", ["~> 3.1.0"])
+  s.add_runtime_dependency("sass", ["~> 3.1.5"])
   s.add_runtime_dependency("coffee-script", ["~> 2.2.0"])
   s.add_runtime_dependency("compass", ["~> 0.11.3"])
   s.add_runtime_dependency("sprockets", ["2.0.0.beta.10"])