diff --git a/Gemfile b/Gemfile
index 83b2b4e..245e951 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem 'pg', '~> 0.18'
 # Heroku Requirements
 gem 'rails_12factor', group: :production # only use on heroku production environment
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+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 3167378..9dd95b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -142,7 +142,8 @@ GEM
     orm_adapter (0.5.0)
     pg (0.21.0)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (5.6.4)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -257,7 +258,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   local_time
   pg (~> 0.18)
-  puma (~> 3.7)
+  puma (~> 5.6)
   rails (~> 5.1.4)
   rails_12factor
   ransack!