diff --git a/Gemfile b/Gemfile
index b5c886c..106175b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.6', '>= 5.2.6.3'
 # 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 8ec91d4..8795295 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -113,7 +113,8 @@ GEM
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (5.6.8)
+      nio4r (~> 2.0)
     rack (2.2.6.2)
     rack-test (2.0.2)
       rack (>= 1.3)
@@ -229,7 +230,7 @@ DEPENDENCIES
   hashdiff
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 5.6)
   rails (~> 5.2.6, >= 5.2.6.3)
   rspec-rails (~> 3.8)
   sass-rails (~> 5.0)