diff --git a/Gemfile b/Gemfile
index fa317b2..5c32d53 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 ruby '2.6.0'
 
 gem 'rails', '~> 5.1'
-gem 'bootstrap-sass', '~> 3.3'
+gem 'bootstrap-sass', '~> 3.4'
 gem 'sass-rails'
 gem 'uglifier'
 gem 'coffee-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index 57ede05..a247d57 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,10 +43,10 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     arel (9.0.0)
-    autoprefixer-rails (9.4.5)
+    autoprefixer-rails (9.7.4)
       execjs
     bindex (0.5.0)
-    bootstrap-sass (3.4.0)
+    bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
       sassc (>= 2.0.0)
     builder (3.2.3)
@@ -62,7 +62,7 @@ GEM
     crass (1.0.4)
     erubi (1.8.0)
     execjs (2.7.0)
-    ffi (1.9.25)
+    ffi (1.12.2)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     i18n (1.5.2)
@@ -124,7 +124,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
-    rake (12.3.2)
+    rake (13.0.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
@@ -140,9 +140,8 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
-    sassc (2.0.0)
-      ffi (~> 1.9.6)
-      rake
+    sassc (2.2.1)
+      ffi (~> 1.9)
     sdoc (0.4.2)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
@@ -179,7 +178,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bootstrap-sass (~> 3.3)
+  bootstrap-sass (~> 3.4)
   byebug
   coffee-rails
   jbuilder