diff --git a/Gemfile b/Gemfile
index fec9bac..66edb80 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.2'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4', '< 0.6.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 5.6'
 # 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 fc19cd0..e3edd54 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -182,7 +182,8 @@ GEM
       rack
     pg (1.2.3)
     public_suffix (4.0.4)
-    puma (3.12.4)
+    puma (5.6.7)
+      nio4r (~> 2.0)
     rack (2.2.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -280,7 +281,7 @@ DEPENDENCIES
   omniauth-google-oauth2
   omniauth-twitter
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 5.6)
   rails (~> 5.2.2)
   sass-rails (~> 5.0)
   spring