diff --git a/Gemfile b/Gemfile
index f32c03d..3ed5ab2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.5.1'
 gem 'rails', '~> 5.2.3'
 gem 'sqlite3'
-gem 'puma', '~> 3.11'
+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 23b149a..b21cc25 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -103,7 +103,7 @@ GEM
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.1.0)
-    puma (3.12.1)
+    puma (3.12.3)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -226,7 +226,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.3)
   rspec-benchmark
   rspec-rails (~> 3.8)