Gemfile in haml-5.0.4 vs Gemfile in haml-5.1.0

@@ -3,10 +3,10 @@
 
 gem "m"
 gem "pry"
 
 group :docs do
-  gem "yard", "~> 0.8.0"
+  gem "yard"
   gem "kramdown"
   gem "sass"
 end
 
 platform :mri do