diff --git a/app/Gemfile b/app/Gemfile
index dce122b..7d82c19 100644
--- a/app/Gemfile
+++ b/app/Gemfile
@@ -9,7 +9,7 @@ gem 'fog',                     '1.40.0'
 gem 'will_paginate',           '3.1.5'
 gem 'bootstrap-will_paginate', '1.0.0'
 gem 'bootstrap-sass',          '3.3.7'
-gem 'puma',                    '3.9.1'
+gem 'puma',                    '3.12.3'
 gem 'sass-rails',              '5.0.6'
 gem 'uglifier',                '3.2.0'
 gem 'coffee-rails',            '4.2.2'
diff --git a/app/Gemfile.lock b/app/Gemfile.lock
index 01da8b2..9e1a38d 100644
--- a/app/Gemfile.lock
+++ b/app/Gemfile.lock
@@ -270,7 +270,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (3.9.1)
+    puma (3.12.3)
     rack (2.0.3)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -383,7 +383,7 @@ DEPENDENCIES
   mini_magick (= 4.7.0)
   minitest-reporters (= 1.1.14)
   pg (= 0.20.0)
-  puma (= 3.9.1)
+  puma (= 3.12.3)
   rails (= 5.1.2)
   rails-controller-testing (= 1.0.2)
   sass-rails (= 5.0.6)
@@ -391,7 +391,6 @@ DEPENDENCIES
   spring-watcher-listen (= 2.0.1)
   therubyracer
   turbolinks (= 5.0.1)
-  tzinfo-data
   uglifier (= 3.2.0)
   web-console (= 3.5.1)
   will_paginate (= 3.1.5)