diff --git a/Gemfile b/Gemfile
index df6935c4..0711779d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,7 +14,7 @@ gem 'rails', '~> 5.0.7'
 gem 'puma', '~> 3.0'
 
 # Use SQLite as the primary database.
-gem 'sqlite3'
+gem 'sqlite3', '~> 1.3'
 
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
@@ -26,7 +26,7 @@ gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
 
 # See https://github.com/rails/execjs#readme for more supported runtimes
-gem 'therubyracer', platforms: :ruby
+gem 'mini_racer', platforms: :ruby
 
 # Use jquery as the JavaScript library
 gem 'jquery-rails'
@@ -55,7 +55,7 @@ gem 'omniauth-bn-launcher', '~> 0.1.0'
 gem 'bigbluebutton-api-ruby'
 
 # Front-end.
-gem 'bootstrap', '~> 4.1.3'
+gem 'bootstrap', '~> 4.3.1'
 gem 'tabler-rubygem'
 
 # For detecting the users preferred language.
diff --git a/Gemfile.lock b/Gemfile.lock
index 720a5cff..30acb359 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -44,16 +44,16 @@ GEM
       public_suffix (>= 2.0.2, < 4.0)
     arel (7.1.4)
     ast (2.4.0)
-    autoprefixer-rails (8.6.4)
+    autoprefixer-rails (9.4.9)
       execjs
     bcrypt (3.1.12)
     bigbluebutton-api-ruby (1.7.0)
       xml-simple (~> 1.1)
     bindex (0.5.0)
-    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)
     coffee-rails (4.2.2)
@@ -114,7 +114,7 @@ GEM
       thor (>= 0.14, < 2.0)
     json (2.1.0)
     jwt (1.5.6)
-    libv8 (3.16.14.19)
+    libv8 (6.7.288.46.1)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -129,6 +129,8 @@ GEM
     mime-types-data (3.2018.0812)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
+    mini_racer (0.2.4)
+      libv8 (>= 6.3)
     minitest (5.11.3)
     multi_json (1.13.1)
     multi_xml (0.6.0)
@@ -176,7 +178,7 @@ GEM
     parser (2.5.1.0)
       ast (~> 2.4.0)
     pg (0.21.0)
-    popper_js (1.14.3)
+    popper_js (1.14.5)
     powerpack (0.1.2)
     public_suffix (3.0.3)
     puma (3.11.4)
@@ -218,7 +220,6 @@ GEM
       ffi (>= 0.5.0, < 2)
     redcarpet (3.4.0)
     redis (3.3.5)
-    ref (2.0.0)
     rest-client (2.0.2)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
@@ -262,6 +263,15 @@ 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 (2.1.0)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
     simplecov (0.16.1)
@@ -286,9 +296,6 @@ GEM
       autoprefixer-rails (>= 6.0.3)
     term-ansicolor (1.6.0)
       tins (~> 1.0)
-    therubyracer (0.12.3)
-      libv8 (~> 3.16.14.15)
-      ref
     thor (0.20.0)
     thread_safe (0.3.6)
     tilt (2.0.8)
@@ -325,7 +332,7 @@ DEPENDENCIES
   action-cable-testing
   bcrypt (~> 3.1.7)
   bigbluebutton-api-ruby
-  bootstrap (~> 4.1.3)
+  bootstrap (~> 4.3.1)
   byebug
   coffee-rails (~> 4.2)
   coveralls
@@ -337,6 +344,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   listen (~> 3.0.5)
+  mini_racer
   omniauth
   omniauth-bn-launcher (~> 0.1.0)
   omniauth-google-oauth2
@@ -355,9 +363,8 @@ DEPENDENCIES
   shoulda-matchers (~> 3.1)
   spring
   spring-watcher-listen (~> 2.0.0)
-  sqlite3
+  sqlite3 (~> 1.3)
   tabler-rubygem
-  therubyracer
   turbolinks (~> 5)
   tzinfo-data
   uglifier (>= 1.3.0)
@@ -365,4 +372,4 @@ DEPENDENCIES
   webmock
 
 BUNDLED WITH
-   1.16.4
+   1.17.1