diff --git a/Gemfile b/Gemfile
index 39b8e6d..36204f5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -36,7 +36,7 @@ gem 'jbuilder', '~> 2.5'
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
 gem 'wicked_pdf'
-gem 'wkhtmltopdf-binary'
+gem 'wkhtmltopdf-binary', '0.9.9'
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platform: :mri