diff --git a/Gemfile b/Gemfile
index 92392c6..16adc17 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails',        '5.1.6'
 gem 'bcrypt',         '3.1.12'
-gem 'bootstrap-sass', '3.3.7'
+gem 'bootstrap-sass', '3.4.1'
 gem 'puma',         '3.9.1'
 gem 'sass-rails',   '5.0.6'
 gem 'uglifier',     '3.2.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index a40183e..e0d6249 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -40,13 +40,13 @@ GEM
       tzinfo (~> 1.1)
     ansi (1.5.0)
     arel (8.0.0)
-    autoprefixer-rails (9.6.1.1)
+    autoprefixer-rails (9.7.0)
       execjs
     bcrypt (3.1.12)
     bindex (0.8.1)
-    bootstrap-sass (3.3.7)
+    bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
-      sass (>= 3.3.4)
+      sassc (>= 2.0.0)
     builder (3.2.3)
     byebug (9.0.6)
     coderay (1.1.2)
@@ -166,6 +166,8 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    sassc (2.2.1)
+      ffi (~> 1.9)
     shellany (0.0.1)
     spring (2.0.2)
       activesupport (>= 4.2)
@@ -204,7 +206,7 @@ PLATFORMS
 
 DEPENDENCIES
   bcrypt (= 3.1.12)
-  bootstrap-sass (= 3.3.7)
+  bootstrap-sass (= 3.4.1)
   byebug (= 9.0.6)
   coffee-rails (= 4.2.2)
   guard (= 2.13.0)