diff --git a/Gemfile b/Gemfile
index eb6108a..6614a20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ end
 
 gem 'rails', '~> 5.0.7.2'
 gem 'pg'
-gem 'puma', '~> 3.8'
+gem 'puma', '~> 3.12'
 
 # gem 'jquery-rails'
 gem 'activeadmin', github: 'activeadmin'
diff --git a/Gemfile.lock b/Gemfile.lock
index d7b55cb..d1eff26 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -320,7 +320,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (3.12.4)
     rack (2.0.7)
     rack-protection (2.0.5)
       rack
@@ -531,7 +531,7 @@ DEPENDENCIES
   mini_magick
   pg
   poltergeist
-  puma (~> 3.8)
+  puma (~> 3.12)
   rails (~> 5.0.7.2)
   rails-controller-testing
   rails-observers!