diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 3cc7613..9c05b59
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'rails', '~> 5.0.3'
 # Use sqlite3 as the database for Active Record
 #gem 'sqlite3'
 # 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 5dc6969..81b00ab
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -287,7 +287,7 @@ GEM
     pkg-config (1.2.0)
     polyamorous (1.3.1)
       activerecord (>= 3.0)
-    puma (3.8.2)
+    puma (3.12.6)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (2.0.3)
@@ -424,7 +424,7 @@ DEPENDENCIES
   omniauth-facebook (~> 4.0.0)
   parallel (~> 1.11.2)
   pdf-reader (~> 2.0.0)
-  puma (~> 3.0)
+  puma (~> 3.12)
   pundit (~> 1.1.0)
   rack-cors (~> 0.4.1)
   rails (~> 5.0.3)