diff --git a/Gemfile b/Gemfile
index e502ddc..f0ebd32 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ end
 
 gem 'rails', '~> 5.1.3'
 gem 'mysql2', '0.4.10'
-gem 'puma', '~> 3.0'
+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 5ee9c92..44f7b7c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -389,7 +389,7 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (3.12.4)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -568,7 +568,7 @@ DEPENDENCIES
   pry-byebug
   pry-doc
   pry-rails
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.1.3)
   sass-globbing
   sass-rails (~> 5.0)