diff --git a/Gemfile b/Gemfile
index 6eba2e4..b4006e3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 ruby '>=2.4.1'
 
 gem 'autoprefixer-rails'
-gem 'bootstrap', '~> 4.1.3'
+gem 'bootstrap', '~> 4.3.1'
 gem 'coffee-rails', '>= 4.0.0'
 gem 'faker'
 gem 'hamlit', '>= 2.7.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 525a9ca..f699277 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -90,10 +90,10 @@ GEM
       rack (>= 0.9.0)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
-    bootstrap (4.1.3)
-      autoprefixer-rails (>= 6.0.3)
-      popper_js (>= 1.12.9, < 2)
-      sass (>= 3.5.2)
+    bootstrap (4.3.1)
+      autoprefixer-rails (>= 9.1.0)
+      popper_js (>= 1.14.3, < 2)
+      sassc-rails (>= 2.0.0)
     builder (3.2.3)
     byebug (10.0.2)
     capistrano (3.11.0)
@@ -412,8 +412,8 @@ GEM
       activesupport (>= 5.0)
       i18n
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     rbovirt (0.1.7)
       nokogiri
       rest-client (> 1.7.0)
@@ -434,7 +434,7 @@ GEM
       nokogiri (~> 1)
       rubyzip (~> 1.1, < 2.0.0)
     rubyzip (1.2.2)
-    sass (3.7.2)
+    sass (3.7.3)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -445,6 +445,15 @@ 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-rails (2.1.0)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     simple_form (4.0.1)
       actionpack (>= 5.0)
       activemodel (>= 5.0)
@@ -488,7 +497,7 @@ DEPENDENCIES
   autoprefixer-rails
   better_errors
   binding_of_caller
-  bootstrap (~> 4.1.3)
+  bootstrap (~> 4.3.1)
   capistrano (~> 3.11.0)
   capistrano-bundler (~> 1.1.2)
   capistrano-rails (~> 1.1.1)