diff --git a/Gemfile b/Gemfile
index 72de998..2f699f1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ end
 
 gem 'rails', '~> 5.1.1'
 gem 'pg', '~> 0.18'
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 3.12'
 gem 'sassc-rails'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index b3a4ddc..bb93d7d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -223,7 +223,7 @@ GEM
       byebug (~> 11.0)
       pry (~> 0.10)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (3.12.4)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-proxy (0.6.5)
@@ -368,7 +368,7 @@ DEPENDENCIES
   normalize-rails
   pg (~> 0.18)
   pry-byebug
-  puma (~> 3.7)
+  puma (~> 3.12)
   rack-cors
   rails (~> 5.1.1)
   rails_real_favicon