diff --git a/middleman-core/features/slim.feature b/middleman-core/features/slim.feature
index c415fefc..187600a1 100644
--- a/middleman-core/features/slim.feature
+++ b/middleman-core/features/slim.feature
@@ -74,4 +74,4 @@ Feature: Support slim templating language
     When I go to "/sass.html"
     Then I should see "html, body, div"
     When I go to "/error.html"
-    Then I should see "Syntax error"
\ No newline at end of file
+    Then I should see "Error: Invalid"
\ No newline at end of file
diff --git a/middleman-core/lib/middleman-core/renderers/sass.rb b/middleman-core/lib/middleman-core/renderers/sass.rb
index bf1578b7..00d786d9 100644
--- a/middleman-core/lib/middleman-core/renderers/sass.rb
+++ b/middleman-core/lib/middleman-core/renderers/sass.rb
@@ -86,7 +86,7 @@ module Middleman
           begin
             @engine.render
           rescue ::Sass::SyntaxError => e
-            ::Sass::SyntaxError.exception_to_css(e, full_exception: true)
+            ::Sass::SyntaxError.exception_to_css(e)
           end
         end
 
diff --git a/middleman/middleman.gemspec b/middleman/middleman.gemspec
index 9ec12ff7..11e4e871 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-sprockets", ">= 3.1.2")
   s.add_dependency("haml", [">= 4.0.5"])
-  s.add_dependency("sass", [">= 3.2.17", "< 4.0"])
+  s.add_dependency("sass", [">= 3.4.0", "< 4.0"])
   s.add_dependency("compass-import-once", ["1.0.5"])
   s.add_dependency("compass", [">= 1.0.0", "< 2.0.0"])
   s.add_dependency("uglifier", ["~> 2.5"])