diff --git a/Gemfile b/Gemfile
index 9abe5ed..4e41521 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,7 +31,7 @@ end
 
 gem 'popper'
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
-gem 'bootstrap', '~> 4.0.0.alpha3.1'
+gem 'bootstrap', '~> 4.3.1'
 gem 'devise'
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 734178d..47afdfd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     archive-zip (0.11.0)
       io-like (~> 0.3.0)
     arel (7.1.4)
-    autoprefixer-rails (8.1.0.1)
+    autoprefixer-rails (9.7.1)
       execjs
     bcrypt (3.1.11)
     better_errors (2.4.0)
@@ -53,10 +53,10 @@ GEM
     bindex (0.5.0)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
-    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)
     byebug (10.0.0)
     capybara (2.18.0)
@@ -102,7 +102,7 @@ GEM
       i18n (>= 0.7)
     faraday (0.14.0)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.23)
+    ffi (1.11.2)
     font-awesome-sass (4.7.0)
       sass (>= 3.2)
     globalid (0.4.1)
@@ -148,7 +148,7 @@ GEM
       slack-notifier
       thor
       toml
-    popper_js (1.12.9)
+    popper_js (1.14.5)
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -183,8 +183,8 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rake (12.3.0)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     redis (3.3.5)
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
@@ -207,7 +207,7 @@ GEM
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
     rubyzip (1.2.1)
-    sass (3.5.5)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -218,6 +218,14 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    sassc (2.2.1)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
@@ -268,7 +276,7 @@ PLATFORMS
 DEPENDENCIES
   better_errors
   binding_of_caller
-  bootstrap (~> 4.0.0.alpha3.1)
+  bootstrap (~> 4.3.1)
   byebug
   capybara (>= 2.7.0)
   chromedriver-helper