diff --git a/Gemfile b/Gemfile
index e022d9c..bfd3223 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,7 +17,7 @@ gem 'rails', '~> 5.2.2'
 # 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 896ea54..339b034 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -119,7 +119,8 @@ GEM
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.1)
-    puma (3.12.2)
+    puma (5.6.2)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -218,7 +219,7 @@ DEPENDENCIES
   fintecture!
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 5.6)
   rails (~> 5.2.2)
   sass-rails (~> 5.0)
   selenium-webdriver