diff --git a/Gemfile b/Gemfile
index 5b3b846..a6973de 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '5.0.7.2'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 303b1a0..83b5517 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
     nokogiri (1.10.2)
       mini_portile2 (~> 2.4.0)
     pg (0.21.0)
-    puma (3.12.1)
+    puma (3.12.2)
     rack (2.0.6)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -189,7 +189,7 @@ DEPENDENCIES
   jquery-rails
   listen (~> 3.0.5)
   pg (~> 0.18)
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (= 5.0.7.2)
   rspec-rails (~> 3.5)
   sass-rails (~> 5.0)