diff --git a/Gemfile b/Gemfile
index e07d6d6..d750b7a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails', '~> 5.0.0'
 gem 'pg'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 
 gem 'sass-rails', git: 'https://github.com/rails/sass-rails'
 gem 'uglifier', '>= 1.3.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2a07ed4..2368e5c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,7 +147,7 @@ GEM
     pg (0.19.0)
     pkg-config (1.1.7)
     public_suffix (2.0.5)
-    puma (3.6.0)
+    puma (3.12.6)
     rack (2.0.1)
     rack-pjax (1.0.0)
       nokogiri (~> 1.5)
@@ -254,7 +254,7 @@ DEPENDENCIES
   metamagic
   nprogress-rails (~> 0.2.0.2)
   pg
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.0)
   rails_admin
   rename