diff --git a/Gemfile b/Gemfile
index f354ea0512..2b8329cd12 100644
--- a/Gemfile
+++ b/Gemfile
@@ -72,6 +72,7 @@ gem 'paper_trail', '~> 3.0.8'
 gem 'diffy'
 gem 'skylight', '< 2.0'
 
+gem 'combine_pdf'
 gem 'wicked_pdf'
 gem 'wkhtmltopdf-binary'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 11590c4cea..1b9a604ecb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -228,6 +228,8 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     colorize (0.8.1)
+    combine_pdf (1.0.15)
+      ruby-rc4 (>= 0.1.5)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -673,6 +675,7 @@ GEM
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-ole (1.2.12.1)
     ruby-progressbar (1.10.0)
+    ruby-rc4 (0.1.5)
     rubyzip (1.2.2)
     safe_yaml (1.0.4)
     sass (3.3.14)
@@ -771,6 +774,7 @@ DEPENDENCIES
   byebug (~> 9.0.0)
   capybara (>= 2.15.4)
   coffee-rails (~> 3.2.1)
+  combine_pdf
   compass-rails
   custom_error_message!
   daemons