Update Gemfile

Co-authored-by: HonkingGoose <[email protected]>

Author: jnavila

Gemfile

@@ -12,5 +12,5 @@ gem 'asciidoctor-pdf', '1.5.3'
 gem 'coderay', '1.1.3'
 gem 'pygments.rb', '1.2.1'
 gem 'thread_safe', '0.3.6'
-gem 'epubcheck-ruby'
-gem 'html-proofer'
+gem 'epubcheck-ruby', '4.2.4.0'
+gem 'html-proofer', '3.17.2'