diff --git a/Gemfile b/Gemfile
index cfda8d1..aab67e6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,7 +19,7 @@ gem 'jbuilder', '~> 2.5'
 gem 'jquery-rails'
 gem 'mini_magick'
 gem 'pg'
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 5.6'
 gem 'rails', '~> 5.1.4'
 gem 'sass-rails', '~> 5.0'
 gem 'sprockets-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index f1d08b6..2250e6c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -150,7 +150,8 @@ GEM
       pry (~> 0.10)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (3.12.4)
+    puma (5.6.2)
+      nio4r (~> 2.0)
     rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -266,7 +267,7 @@ DEPENDENCIES
   pg
   pry-byebug
   pry-rails
-  puma (~> 3.12)
+  puma (~> 5.6)
   rails (~> 5.1.4)
   rails-controller-testing
   rspec-rails (~> 3.8)