diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index d7d2ec9..5e6b21e
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'rails', '~> 5.0.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+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
old mode 100755
new mode 100644
index 87cf8c8..b7ce95a
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -119,7 +119,7 @@ GEM
       actionmailer (>= 3, < 6)
       premailer (~> 1.7, >= 1.7.9)
     public_suffix (3.0.1)
-    puma (3.11.2)
+    puma (3.12.6)
     rack (2.0.4)
     rack-protection (2.0.0)
       rack
@@ -241,7 +241,7 @@ DEPENDENCIES
   materialize-sass
   pg (~> 0.18)
   premailer-rails
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.1)
   redis
   rspec-rails (~> 3.5)