diff --git a/Gemfile.lock b/Gemfile.lock
index 88c1eb9..9910448 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,13 +1,9 @@
 GIT
-  remote: git://github.com/rails/sass-rails.git
-  revision: 8e68c5f24ed6487277e9df531ec57b375ad1bea2
+  remote: https://github.com/rails/sass-rails.git
+  revision: 551251bddec4d6b75446cb1c1630ed26e5318f8e
   specs:
-    sass-rails (5.0.3)
-      railties (>= 4.0.0, < 5.0)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
 
 GEM
   remote: https://rubygems.org/
@@ -83,6 +79,7 @@ GEM
     execjs (2.5.2)
     faraday (0.9.1)
       multipart-post (>= 1.2, < 3)
+    ffi (1.12.2)
     gemoji (2.1.0)
     github-linguist (4.5.5)
       charlock_holmes (~> 0.7.3)
@@ -187,7 +184,14 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.4.4)
       nokogumbo (= 1.4.1)
-    sass (3.4.14)
+    sassc (2.4.0)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     sawyer (0.6.0)
       addressable (~> 2.3.5)
       faraday (~> 0.8, < 0.10)
@@ -215,9 +219,9 @@ GEM
       html-pipeline
     temple (0.7.6)
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.1)
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     virtus (1.0.5)
       axiom-types (~> 0.1)