Specify the acts-as-taggable-on version

shotengai.gemspec

@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   
   spec.add_dependency 'aasm'
-  spec.add_dependency 'acts-as-taggable-on'
+  spec.add_dependency 'acts-as-taggable-on', '~> 5.0.0'
   spec.add_dependency 'rails'
 
   # TODO: instead of gems below