diff --git a/Gemfile b/Gemfile
index 4bdad90..36d38aa 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.3'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # 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 837674d..c531a92 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -106,7 +106,8 @@ GEM
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     public_suffix (4.0.7)
-    puma (3.12.6)
+    puma (5.6.7)
+      nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -202,7 +203,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 5.6)
   rails (~> 5.2.3)
   sass-rails (~> 5.0)
   selenium-webdriver