diff --git a/Gemfile b/Gemfile
index e51eb48..92b5b4d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.0.0'
 # 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
index d1840f9..5ed2393 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -40,6 +40,7 @@ GEM
       tzinfo (~> 1.1)
     arel (7.0.0)
     builder (3.2.2)
+    byebug (11.1.3)
     coffee-rails (4.2.1)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0, < 5.2.x)
@@ -73,11 +74,14 @@ GEM
     minitest (5.9.0)
     multi_json (1.12.1)
     nio4r (1.2.1)
+    nokogiri (1.6.8)
+      mini_portile2 (~> 2.1.0)
+      pkg-config (~> 1.1.7)
     nokogiri (1.6.8-x86-mingw32)
       mini_portile2 (~> 2.1.0)
       pkg-config (~> 1.1.7)
     pkg-config (1.1.7)
-    puma (3.4.0)
+    puma (3.12.6)
     rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -119,6 +123,7 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    sqlite3 (1.3.11)
     sqlite3 (1.3.11-x86-mingw32)
     thor (0.19.1)
     thread_safe (0.3.5)
@@ -142,6 +147,7 @@ GEM
     websocket-extensions (0.1.2)
 
 PLATFORMS
+  ruby
   x86-mingw32
 
 DEPENDENCIES
@@ -149,7 +155,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   jquery-rails
-  puma (~> 3.0)
+  puma (~> 3.12)
   rails (~> 5.0.0)
   sass-rails (~> 5.0)
   sqlite3