diff --git a/Gemfile b/Gemfile
index f282306..3311ab5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ ruby '2.5.1'
 gem 'dotenv-rails'
 gem 'rails', '~> 5.2.3'
 # Use postgresql as the database for Active Record
-gem 'bootstrap', '~> 4.0.0'
+gem 'bootstrap', '~> 4.3.1'
 gem 'devise'
 gem 'font-awesome-rails'
 gem 'jquery-rails', '~> 4.3', '>= 4.3.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5985fb3..69c3e00 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,16 +47,16 @@ GEM
     archive-zip (0.12.0)
       io-like (~> 0.3.0)
     arel (9.0.0)
-    autoprefixer-rails (9.6.5)
+    autoprefixer-rails (9.7.0)
       execjs
     bcrypt (3.1.13)
     bindex (0.8.1)
     bootsnap (1.4.5)
       msgpack (~> 1.0)
-    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)
     byebug (11.0.1)
     capybara (3.29.0)
@@ -224,6 +224,14 @@ 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
     selenium-webdriver (3.142.6)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
@@ -272,7 +280,7 @@ PLATFORMS
 
 DEPENDENCIES
   bootsnap (>= 1.1.0)
-  bootstrap (~> 4.0.0)
+  bootstrap (~> 4.3.1)
   byebug
   capybara (>= 2.15)
   chromedriver-helper