diff --git a/Gemfile b/Gemfile
index 1c4d629..1777e27 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'bootstrap-sass', '~> 3.3.6'
 gem 'bootstrap_form'
 gem 'bootswatch-rails'
 gem 'jquery-rails'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
 gem 'sass-rails', '~> 5.0'
 gem 'sqlite3'
diff --git a/Gemfile.lock b/Gemfile.lock
index a5944d9..fc5a1f9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -78,7 +78,7 @@ GEM
     nio4r (1.2.1)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-    puma (3.6.2)
+    puma (3.12.6)
     rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -169,7 +169,7 @@ DEPENDENCIES
   bootswatch-rails
   byebug
   jquery-rails
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.0, >= 5.0.0.1)
   rspec-rails (~> 3.5)
   sass-rails (~> 5.0)