diff --git a/Gemfile b/Gemfile
index 0d5cc4a..9a07637 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails', '~> 5.0'
 gem 'rake', '>= 13.0.1'
-gem 'puma', '~> 5.3.2'
+gem 'puma', '~> 5.6.4'
 gem 'bootsnap'
 gem 'listen'
 gem 'actionpack-page_caching'
diff --git a/Gemfile.lock b/Gemfile.lock
index d55040e..a902078 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -374,7 +374,7 @@ GEM
       pry (~> 0.9)
       slop (~> 3.0)
     public_suffix (4.0.6)
-    puma (5.3.2)
+    puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
@@ -673,7 +673,7 @@ DEPENDENCIES
   pry-git
   pry-rails
   pry-remote
-  puma (~> 5.3.2)
+  puma (~> 5.6.4)
   rails (~> 5.0)
   rails-controller-testing
   rake (>= 13.0.1)