diff --git a/Gemfile.lock b/Gemfile.lock
index 9aff5cb..aa2bfac 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,14 +47,14 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.4.0)
     arel (6.0.3)
-    autoprefixer-rails (6.3.6)
+    autoprefixer-rails (9.8.6.3)
       execjs
     bcrypt (3.1.15)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    bootstrap-sass (3.3.6)
+    bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
-      sass (>= 3.3.4)
+      sassc (>= 2.0.0)
     builder (3.2.4)
     byebug (8.2.5)
     capybara (2.7.0)
@@ -82,12 +82,13 @@ GEM
       warden (~> 1.2.3)
     diff-lcs (1.2.5)
     erubis (2.7.0)
-    execjs (2.6.0)
+    execjs (2.7.0)
     factory_girl (4.7.0)
       activesupport (>= 3.0.0)
     factory_girl_rails (4.7.0)
       factory_girl (~> 4.7.0)
       railties (>= 3.0.0)
+    ffi (1.13.1)
     font-awesome-sass (4.4.0)
       sass (>= 3.2)
     globalid (0.3.6)
@@ -150,6 +151,9 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (13.0.1)
+    rb-fsevent (0.10.4)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
     rdoc (4.2.2)
       json (~> 1.4)
     responders (2.4.1)
@@ -172,13 +176,19 @@ GEM
       rspec-mocks (~> 3.4.0)
       rspec-support (~> 3.4.0)
     rspec-support (3.4.1)
-    sass (3.4.22)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
     sass-rails (5.0.4)
       railties (>= 4.0.0, < 5.0)
       sass (~> 3.1)
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    sassc (2.4.0)
+      ffi (~> 1.9)
     sdoc (0.4.1)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)