diff --git a/Gemfile b/Gemfile
index 84d01f4..4896351 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
 gem 'pg', '~> 0.18'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 6d0aee0..cf1f8ef 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -171,7 +171,7 @@ GEM
       slop (~> 3.4)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
-    puma (3.6.0)
+    puma (3.12.4)
     rack (2.0.1)
     rack-protection (1.5.3)
       rack
@@ -320,7 +320,7 @@ DEPENDENCIES
   paperclip (~> 5.1.0)
   pg (~> 0.18)
   pry-rails
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.0, >= 5.0.0.1)
   rails-assets-tether (>= 1.1.0)
   rollbar