Gemfile in html-pipeline-2.5.0 vs Gemfile in html-pipeline-2.6.0

@@ -12,10 +12,10 @@
 group :test do
   gem "minitest"
   gem "rinku",              "~> 1.7",   :require => false
   gem "gemoji",             "~> 2.0",   :require => false
   gem "RedCloth",           "~> 4.2.9", :require => false
-  gem "github-markdown",    "~> 0.5",   :require => false
+  gem "commonmarker",       "~> 0.14",  :require => false
   gem "email_reply_parser", "~> 0.5",   :require => false
   gem "sanitize",           "~> 2.0",   :require => false
 
   if RUBY_VERSION < "2.1.0"
     gem "escape_utils",     "~> 0.3",   :require => false