diff --git a/Gemfile b/Gemfile
index 69ef972..5e0530a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.4.0'
 
 gem 'rails', '~> 5.2.2'
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'jbuilder', '~> 2.5'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2f95569..2f7e1a9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -188,8 +188,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (3.0.3)
-    puma (3.12.1)
-    puma (3.12.1-java)
+    puma (3.12.3)
+    puma (3.12.3-java)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -370,7 +370,7 @@ DEPENDENCIES
   pry
   pry-byebug
   pry-rails
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.2.2)
   rails-controller-testing
   rails_layout