diff --git a/Gemfile b/Gemfile
index 0a0406f6..ac2733a2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem 'bcrypt', '~> 3.1.7'
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
 
-gem 'bootstrap', '~> 4.0.0'
+gem 'bootstrap', '~> 4'
 gem 'carrierwave'
 gem 'carrierwave-bombshelter'
 gem 'carrierwave-i18n'
diff --git a/Gemfile.lock b/Gemfile.lock
index 49fb3deb..b8362c06 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,15 +48,15 @@ GEM
       sshkit (>= 1.6.1, != 1.7.0)
     arel (9.0.0)
     ast (2.4.0)
-    autoprefixer-rails (9.5.0)
+    autoprefixer-rails (9.6.1)
       execjs
     bcrypt (3.1.12)
     bcrypt_pbkdf (1.0.0)
     bindex (0.5.0)
-    bootstrap (4.0.0)
-      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)
     capistrano (3.11.0)
       airbrussh (>= 1.0.0)
@@ -117,7 +117,7 @@ GEM
       activesupport (>= 4.0, < 6)
     execjs (2.7.0)
     fastimage (2.1.5)
-    ffi (1.10.0)
+    ffi (1.11.1)
     font-awesome-rails (4.7.0.4)
       railties (>= 3.2, < 6.0)
     forwardable-extended (2.6.0)
@@ -198,7 +198,7 @@ GEM
     net-ssh (5.2.0)
     netaddr (2.0.3)
     nio4r (2.3.1)
-    nokogiri (1.10.2)
+    nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     parallel (1.16.0)
     parser (2.6.2.0)
@@ -267,7 +267,7 @@ GEM
       sexp_processor (~> 4.9)
     rubyzip (1.2.2)
     safe_yaml (1.0.5)
-    sass (3.7.3)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -278,6 +278,15 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    sassc (2.0.1)
+      ffi (~> 1.9)
+      rake
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     selenium-webdriver (3.141.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.2, >= 1.2.2)
@@ -336,7 +345,7 @@ PLATFORMS
 DEPENDENCIES
   bcrypt (~> 3.1.7)
   bcrypt_pbkdf
-  bootstrap (~> 4.0.0)
+  bootstrap (~> 4)
   capistrano
   capistrano-bundler
   capistrano-passenger