diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 4e2bfcb..8800db1
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'nested_form', '~> 0.3.2'
 # Use mysql as the database for Active Record
 gem 'mysql2'
 # 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 2896291..a2317d1
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -123,7 +123,7 @@ GEM
       jquery-rails
       paperclip (>= 3.4)
       rails (>= 3.1)
-    puma (3.12.0)
+    puma (3.12.6)
     rack (2.0.5)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -230,7 +230,7 @@ DEPENDENCIES
   nested_form (~> 0.3.2)
   paperclip (~> 5.1)
   papercrop (~> 0.3.0)
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.2, >= 5.2.1)
   redis (~> 3.0)
   russian (~> 0.6.0)