diff --git a/Gemfile b/Gemfile
index 888550f..05eac7a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '4.2.5'
 # http://stackoverflow.com/questions/35893584/nomethoderror-undefined-method-last-comment-after-upgrading-to-rake-11
 gem 'rake', '< 11.0'
 
-gem 'bootstrap-sass', '3.2.0.0'
+gem 'bootstrap-sass', '3.4.1'
 
 gem 'bootstrap-datepicker-rails'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 7a21d8f..4c66b87 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,6 +39,8 @@ GEM
     addressable (2.5.0)
       public_suffix (~> 2.0, >= 2.0.2)
     arel (6.0.4)
+    autoprefixer-rails (9.7.1)
+      execjs
     bcrypt (3.1.11)
     bcrypt-ruby (3.1.5)
       bcrypt (>= 3.1.3)
@@ -50,8 +52,9 @@ GEM
       debug_inspector (>= 0.0.1)
     bootstrap-datepicker-rails (1.6.4.1)
       railties (>= 3.0)
-    bootstrap-sass (3.2.0.0)
-      sass (~> 3.2)
+    bootstrap-sass (3.4.1)
+      autoprefixer-rails (>= 5.2.1)
+      sassc (>= 2.0.0)
     builder (3.2.3)
     byebug (9.0.6)
     capybara (2.2.1)
@@ -211,6 +214,8 @@ GEM
       sass (~> 3.2.2)
       sprockets (~> 2.8, < 3.0)
       sprockets-rails (~> 2.0)
+    sassc (2.2.1)
+      ffi (~> 1.9)
     sdoc (0.4.2)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
@@ -250,7 +255,7 @@ DEPENDENCIES
   better_errors
   binding_of_caller
   bootstrap-datepicker-rails
-  bootstrap-sass (= 3.2.0.0)
+  bootstrap-sass (= 3.4.1)
   byebug
   capybara (~> 2.2.0)
   coffee-rails (~> 4.0.0)