diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba00507b..41b5ad1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 master
 ===
 
+* Only SassC from now on.
 * Add `--dry-run` to run a build, but skip outputting to disk.
 * Incremental builds: `--track-dependencies` and `--only-changed` flags (#2220)
 * Remove Rack support in favor of `resource.filters << proc { |oldbody| newbody }`
diff --git a/Gemfile.lock b/Gemfile.lock
index bc35a7ad..f1987268 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,7 +27,6 @@ PATH
       parallel
       rack (>= 1.4.5, < 3)
       rgl (~> 0.5.3)
-      sass (>= 3.4)
       sassc (~> 2.0)
       servolux
       tilt (~> 2.0.9)
@@ -198,11 +197,6 @@ GEM
       celluloid (= 0.16.0)
       celluloid-io (= 0.16.2)
       timers (~> 4.0.1)
-    sass (3.7.2)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
     sassc (2.0.0)
       ffi (~> 1.9.6)
       rake
diff --git a/middleman-core/features/scss-support.feature b/middleman-core/features/scss-support.feature
index 0b380f06..6dff8d09 100644
--- a/middleman-core/features/scss-support.feature
+++ b/middleman-core/features/scss-support.feature
@@ -9,4 +9,9 @@ Feature: Support SCSS Syntax
  Scenario: Rendering scss
    Given the Server is running at "scss-app"
    When I go to "/stylesheets/layout.css"
-   Then I should see "html"
\ No newline at end of file
+   Then I should see "html"
+
+ Scenario: Rendering scss errors
+   Given the Server is running at "scss-app"
+   When I go to "/stylesheets/error.css"
+   Then I should see "Error:"
\ No newline at end of file
diff --git a/middleman-core/fixtures/scss-app/source/stylesheets/error.css.sass b/middleman-core/fixtures/scss-app/source/stylesheets/error.css.sass
new file mode 100644
index 00000000..fc6f4bd0
--- /dev/null
+++ b/middleman-core/fixtures/scss-app/source/stylesheets/error.css.sass
@@ -0,0 +1 @@
+@include invalid-mixin;
\ No newline at end of file
diff --git a/middleman-core/lib/middleman-core/extensions/minify_css.rb b/middleman-core/lib/middleman-core/extensions/minify_css.rb
index ba99748f..2859d784 100644
--- a/middleman-core/lib/middleman-core/extensions/minify_css.rb
+++ b/middleman-core/lib/middleman-core/extensions/minify_css.rb
@@ -2,13 +2,13 @@ require 'active_support/core_ext/object/try'
 require 'memoist'
 require 'middleman-core/contracts'
 require 'rack/mime'
+require 'sassc'
 
 # Minify CSS Extension
 class Middleman::Extensions::MinifyCss < ::Middleman::Extension
   option :inline, false, 'Whether to minify CSS inline within HTML files'
   option :ignore, [], 'Patterns to avoid minifying'
   option :compressor, proc {
-    require 'sass'
     SassCompressor
   }, 'Set the CSS compressor to use.'
   option :content_types, %w[text/css], 'Content types of resources that contain CSS'
@@ -20,15 +20,13 @@ class Middleman::Extensions::MinifyCss < ::Middleman::Extension
     COMPRESSED_OPTIONS = { style: :compressed }.freeze
 
     def self.compress(style, options_hash = ::Middleman::EMPTY_HASH)
-      root_node = ::Sass::SCSS::CssParser.new(style, 'middleman-css-input', 1).parse
+      options = if options_hash == ::Middleman::EMPTY_HASH
+                  COMPRESSED_OPTIONS
+                else
+                  options_hash.merge(COMPRESSED_OPTIONS)
+                end
 
-      root_node.options = if options_hash == ::Middleman::EMPTY_HASH
-                            COMPRESSED_OPTIONS
-                          else
-                            options_hash.merge(COMPRESSED_OPTIONS)
-                          end
-
-      root_node.render.strip
+      ::SassC::Engine.new(style, options).render.strip
     end
   end
 
diff --git a/middleman-core/lib/middleman-core/renderers/sass.rb b/middleman-core/lib/middleman-core/renderers/sass.rb
index 117d5e9c..970b0010 100644
--- a/middleman-core/lib/middleman-core/renderers/sass.rb
+++ b/middleman-core/lib/middleman-core/renderers/sass.rb
@@ -1,13 +1,8 @@
 require 'hamster'
-require 'sass'
+require 'sassc'
 require 'middleman-core/dependencies'
 require 'middleman-core/dependencies/vertices/file_vertex'
 
-begin
-  require 'sassc'
-rescue LoadError
-end
-
 module Middleman
   module Renderers
     # Sass renderer
@@ -25,8 +20,6 @@ module Middleman
       def initialize(app, options_hash = ::Middleman::EMPTY_HASH, &block)
         super
 
-        logger.info '== Preferring use of LibSass' if defined?(::SassC)
-
         app.files.ignore :sass_cache, :source, /(^|\/)\.sass-cache\// if app.config[:sass_cache_location] == DEFAULT_SASS_CACHE_LOCATION
 
         # Tell Tilt to use it as well (for inline sass blocks)
@@ -62,21 +55,31 @@ module Middleman
         def evaluate(context, _)
           @context ||= context
 
-          sass_module = if defined?(::SassC)
-                          ::SassC
-                        else
-                          ::Sass
-                        end
-
-          @engine = sass_module::Engine.new(data, sass_options)
+          @engine = ::SassC::Engine.new(data, sass_options)
 
           begin
             @engine.render
-          rescue sass_module::SyntaxError => e
-            ::Sass::SyntaxError.exception_to_css(e)
+          rescue ::SassC::SyntaxError => e
+            exception_to_css(e)
           end
         end
 
+        def exception_to_css(e)
+          header = "#{e.class}: #{e.message}"
+
+          <<~END
+            /*
+            #{header.gsub('*/', '*\\/')}
+
+            Backtrace:\n#{e.backtrace.join("\n").gsub('*/', '*\\/')}
+            */
+            body:before {
+              white-space: pre;
+              font-family: monospace;
+              content: "#{header.gsub('"', '\"').gsub("\n", '\\A ')}"; }
+          END
+        end
+
         def vertices
           @engine.dependencies.reduce(::Hamster::Set.empty) do |sum, d|
             sum << ::Middleman::Dependencies::FileVertex.new(@context.app.root_path, d.filename.to_sym)
@@ -91,7 +94,7 @@ module Middleman
           ctx = @context
 
           more_opts = {
-            load_paths: ::Sass.load_paths | ctx.app.config[:sass_assets_paths],
+            load_paths: ctx.app.config[:sass_assets_paths],
             filename: eval_file,
             line: line,
             syntax: syntax,
diff --git a/middleman-core/lib/middleman-core/renderers/sass_functions.rb b/middleman-core/lib/middleman-core/renderers/sass_functions.rb
index 5270929f..34c73aa4 100644
--- a/middleman-core/lib/middleman-core/renderers/sass_functions.rb
+++ b/middleman-core/lib/middleman-core/renderers/sass_functions.rb
@@ -16,7 +16,7 @@ module Middleman
       #
       def image_path(source, options_hash = ::Middleman::EMPTY_HASH)
         p = ::Middleman::Util.asset_path(middleman_context, :images, source.value, map_options(options_hash))
-        ::Sass::Script::String.new p.to_s, :string
+        ::SassC::Script::Value::String.new p.to_s, :string
       end
 
       # Using Middleman::Util#asset_path, return the url CSS
@@ -40,7 +40,8 @@ module Middleman
             options = {}
           end
         end
-        ::Sass::Script::String.new "url(#{image_path(source, options)})"
+
+        ::SassC::Script::Value::String.new "url(#{image_path(source, options)})"
       end
 
       # Using Middleman::Util#asset_path, return the full path
@@ -54,7 +55,7 @@ module Middleman
       #
       def font_path(source, options_hash = ::Middleman::EMPTY_HASH)
         p = ::Middleman::Util.asset_path(middleman_context, :fonts, source.value, map_options(options_hash))
-        ::Sass::Script::String.new p.to_s, :string
+        ::SassC::Script::Value::String.new p.to_s, :string
       end
 
       # Using Middleman::Util#asset_path, return the url CSS
@@ -78,7 +79,7 @@ module Middleman
             options = {}
           end
         end
-        ::Sass::Script::String.new "url(#{font_path(source, options)})"
+        ::SassC::Script::Value::String.new "url(#{font_path(source, options)})"
       end
 
       protected
@@ -99,9 +100,9 @@ module Middleman
       def map_options(options_hash = ::Middleman::EMPTY_HASH) # :nodoc:
         options = options_hash.dup
 
-        ::Sass::Util.map_hash(options) do |key, value|
-          [key.to_sym, value.respond_to?(:value) ? value.value : value]
-        end
+        # ::SassC::Util.map_hash(options) do |key, value|
+        #   [key.to_sym, value.respond_to?(:value) ? value.value : value]
+        # end
 
         options[:current_resource] = current_resource
 
@@ -111,8 +112,4 @@ module Middleman
   end
 end
 
-if defined?(::SassC)
-  ::SassC::Script::Functions.send :include, ::Middleman::Sass::Functions
-elsif defined?(::Sass)
-  ::Sass::Script::Functions.send :include, ::Middleman::Sass::Functions
-end
+::SassC::Script::Functions.send :include, ::Middleman::Sass::Functions
diff --git a/middleman-core/middleman-core.gemspec b/middleman-core/middleman-core.gemspec
index 5bee8451..a6bd34e2 100644
--- a/middleman-core/middleman-core.gemspec
+++ b/middleman-core/middleman-core.gemspec
@@ -44,8 +44,7 @@ Gem::Specification.new do |s|
   # Automatic Image Sizes
   s.add_dependency('fastimage', ['~> 2.0'])
 
-  # Minify CSS
-  s.add_dependency('sass', ['>= 3.4'])
+  # Sass and Minify CSS
   s.add_dependency('sassc', ['~> 2.0'])
 
   # Minify JS
diff --git a/middleman/middleman.gemspec b/middleman/middleman.gemspec
index a2a517e4..223d5d49 100644
--- a/middleman/middleman.gemspec
+++ b/middleman/middleman.gemspec
@@ -20,7 +20,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency('middleman-core', Middleman::VERSION)
   s.add_dependency('middleman-cli', Middleman::VERSION)
-  s.add_dependency('sass', ['>= 3.4.0', '< 4.0'])
   s.add_dependency('haml', ['>= 4.0.5'])
   s.add_dependency('coffee-script', ['~> 2.2'])
   s.add_dependency('kramdown', ['~> 1.2'])