diff --git a/Gemfile b/Gemfile
index da3617a8..9e2814d3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -90,7 +90,7 @@ gem 'jquery-rails'
 gem 'font-awesome-rails'
 gem 'wicked_pdf'
 gem 'wkhtmltopdf-binary',  '0.12.4'
-gem 'bootstrap', '~> 4.1.1'
+gem 'bootstrap', '~> 4.3.1'
 # gem "bootstrap", ">= 4.3.1"
 gem 'oai'
 # Google Material Icons
diff --git a/Gemfile.lock b/Gemfile.lock
index ba826a16..2c3b1e54 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,8 +45,8 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     arel (9.0.0)
-    autoprefixer-rails (10.2.5.1)
-      execjs (> 0)
+    autoprefixer-rails (10.3.1.0)
+      execjs (~> 2)
     bcrypt (3.1.16)
     bindex (0.8.1)
     blacklight (7.7.0)
@@ -57,10 +57,10 @@ GEM
       rails (>= 5.1, < 7)
     blacklight_range_limit (7.7.0)
       blacklight (>= 7.0)
-    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)
     bootstrap-slider-rails (9.8.0)
       railties (>= 3.2, < 6.0)
     builder (3.2.4)
@@ -160,7 +160,7 @@ GEM
       activerecord
       kaminari-core (= 1.2.1)
     kaminari-core (1.2.1)
-    libv8-node (15.14.0.1-x86_64-linux)
+    libv8-node (15.14.0.1)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -182,12 +182,14 @@ GEM
       nokogiri (~> 1)
       rake
     mini_mime (1.1.0)
+    mini_portile2 (2.5.3)
     mini_racer (0.4.0)
       libv8-node (~> 15.14.0.0)
     minitest (5.14.4)
     multipart-post (2.1.1)
     nio4r (2.5.7)
-    nokogiri (1.11.7-x86_64-linux)
+    nokogiri (1.11.7)
+      mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     oai (1.1.0)
       builder (>= 3.1.0)
@@ -243,11 +245,6 @@ GEM
     rubycas-client (2.3.9)
       activesupport
     rubyzip (1.3.0)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
     sassc (2.4.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
@@ -313,7 +310,7 @@ DEPENDENCIES
   activesupport (~> 5.2.4.5)
   blacklight (= 7.7.0)
   blacklight_range_limit (~> 7.7.0)
-  bootstrap (~> 4.1.1)
+  bootstrap (~> 4.3.1)
   bootstrap-slider-rails
   byebug
   capybara (~> 2.13)