diff --git a/Gemfile b/Gemfile
index f873829f5..85211c5e2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem 'uglifier', '>= 1.0.3'
 # gem 'therubyracer', platforms: :ruby
 # gem 'duktape'
 
-gem 'bootstrap', '~> 4.1.0'
+gem 'bootstrap', '~> 4.3.1'
 gem 'chart-js-rails'
 gem 'jquery-rails'
 gem 'jquery-ui-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index bf7ab7f49..5f79e8fa6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,10 +79,10 @@ GEM
     ast (2.4.2)
     autoprefixer-rails (10.4.7.0)
       execjs (~> 2)
-    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)
     brakeman (5.2.3)
     builder (3.2.4)
     capistrano (3.17.0)
@@ -293,6 +293,14 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    sassc (2.4.0)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     select2-rails (4.0.13)
     sexp_processor (4.16.1)
     spawnling (2.1.5)
@@ -335,7 +343,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bootstrap (~> 4.1.0)
+  bootstrap (~> 4.3.1)
   brakeman
   capistrano (~> 3.11)
   capistrano-bundler