diff --git a/Gemfile b/Gemfile
index f595468..6255cfe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,7 +23,7 @@ gem 'bootstrap', '~> 4.3.1'
 # gem 'font-awesome-sass', '~> 4.7.0'
 gem 'font-awesome5-rails'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index cd4f3ac..6d22426 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -220,7 +220,8 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.1.0)
-    puma (3.11.4)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.0.5)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -346,7 +347,7 @@ DEPENDENCIES
   json!
   pg (= 0.18.4)
   pry-rails
-  puma (~> 3.0)
+  puma (~> 4.3)
   rails (~> 5.0.2)
   responders
   sass-rails (~> 5.0)