diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index f9538af..5bf6f3c
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'rails', '~> 5.2.3'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 3.12'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0.7'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 65cb297..9e6efa5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -100,7 +100,7 @@ GEM
       mini_portile2 (~> 2.3.0)
     pg (0.21.0)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.6)
     rack (2.0.5)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -210,7 +210,7 @@ DEPENDENCIES
   jbuilder (~> 2.9.1)
   listen (>= 3.0.5, < 3.2)
   pg (~> 0.18)
-  puma (~> 3.7)
+  puma (~> 3.12)
   rails (~> 5.2.3)
   rspec-rails (~> 3.8.0)
   rspec_junit_formatter