diff --git a/Gemfile b/Gemfile
index cebec5b..abef57c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ end
 
 ruby '2.4.5'
 gem 'rails', '~> 5.2.3'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 5.6'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index b3e9e90..1f6d8e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -159,7 +159,8 @@ GEM
     prawn-table (0.2.2)
       prawn (>= 1.3.0, < 3.0.0)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (5.6.8)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -272,7 +273,7 @@ DEPENDENCIES
   pg (~> 1.1)
   prawn-rails (~> 1.0)
   prawn-svg
-  puma (~> 3.7)
+  puma (~> 5.6)
   rails (~> 5.2.3)
   rails_layout
   sass-rails (~> 5.0)