diff --git a/Gemfile b/Gemfile
index c6b851f..c314142 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '4.2.11.1'
 # http://stackoverflow.com/questions/35893584/nomethoderror-undefined-method-last-comment-after-upgrading-to-rake-11
 gem 'rake', '< 11.0'
 
-gem 'bootstrap-sass', '3.2.0.4'
+gem 'bootstrap-sass', '3.4.1'
 
 gem 'bootstrap-datepicker-rails'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 94f2fb5..2fe6ad0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,6 +38,8 @@ GEM
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     arel (6.0.4)
+    autoprefixer-rails (10.2.4.0)
+      execjs
     bcrypt (3.1.16)
     bcrypt-ruby (3.1.5)
       bcrypt (>= 3.1.3)
@@ -49,8 +51,9 @@ GEM
       debug_inspector (>= 0.0.1)
     bootstrap-datepicker-rails (1.9.0.1)
       railties (>= 3.0)
-    bootstrap-sass (3.2.0.4)
-      sass (~> 3.2)
+    bootstrap-sass (3.4.1)
+      autoprefixer-rails (>= 5.2.1)
+      sassc (>= 2.0.0)
     builder (3.2.4)
     byebug (11.1.3)
     capybara (2.2.1)
@@ -216,6 +219,8 @@ GEM
       sass (~> 3.2.2)
       sprockets (~> 2.8, < 3.0)
       sprockets-rails (~> 2.0)
+    sassc (2.4.0)
+      ffi (~> 1.9)
     sdoc (2.0.3)
       rdoc (>= 5.0)
     shellany (0.0.1)
@@ -253,7 +258,7 @@ DEPENDENCIES
   better_errors
   binding_of_caller
   bootstrap-datepicker-rails
-  bootstrap-sass (= 3.2.0.4)
+  bootstrap-sass (= 3.4.1)
   byebug
   capybara (~> 2.2.0)
   coffee-rails (~> 4.0.0)