diff --git a/Gemfile b/Gemfile
index 89115a5..d6d67f1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -45,7 +45,7 @@ gem 'rails', '~> 5.2.2'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 # Use Uglifier as compressor for JavaScript assets
 gem 'uglifier', '>= 1.3.0'
 # See https://github.com/rails/execjs#readme for more supported runtimes
diff --git a/Gemfile.lock b/Gemfile.lock
index 68a52ae..810e86b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -206,8 +206,10 @@ GEM
       activesupport (>= 5.2)
     popper_js (1.14.7)
     public_suffix (4.0.6)
-    puma (3.12.6)
-    puma (3.12.6-java)
+    puma (4.3.8)
+      nio4r (~> 2.0)
+    puma (4.3.8-java)
+      nio4r (~> 2.0)
     pundit (2.1.0)
       activesupport (>= 3.0.0)
     racc (1.5.2)
@@ -368,7 +370,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pg_search
   popper_js (~> 1.14.5)
-  puma (~> 3.12)
+  puma (~> 4.3)
   pundit
   rails (~> 5.2.2)
   rails_admin (~> 2.0)