diff --git a/Gemfile b/Gemfile
index 7a541cb..e4dde90 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ ruby '2.4.2'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.1.6'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+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 e99891f..792727d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -121,7 +121,7 @@ GEM
       rack
     pg (1.0.0)
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (3.12.4)
     rack (2.0.5)
     rack-proxy (0.6.4)
       rack
@@ -221,7 +221,7 @@ DEPENDENCIES
   omniauth
   omniauth-twitter
   pg
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.1.6)
   sass-rails (~> 5.0)
   selenium-webdriver