diff --git a/Gemfile b/Gemfile
index bf5ab6031..c80e26797 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
 gem 'asciidoctor', '2.0.11'
-gem 'asciidoctor-multipage', '0.0.12 '
+gem 'asciidoctor-multipage', '0.0.12'
 gem 'concurrent-ruby', '1.1.7'
 gem 'tilt', '2.0.10'