diff --git a/README.md b/README.md
index 904f308..826dba6 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,10 @@ And then execute:
 
     $ bundle
 
+If you use committee prior to 4.4.0, you have to use committee-rails 0.5.x. Please see below.
+
+[0.5 (0-5-stable) documentation](https://github.com/willnet/committee-rails/tree/0-5-stable)
+
 If you use committee prior to 3.0, you have to use committee-rails 0.4.x. Please see below.
 
 [0.4 (0-4-stable) documentation](https://github.com/willnet/committee-rails/tree/0-4-stable)
diff --git a/committee-rails.gemspec b/committee-rails.gemspec
index 4e8f404..6556037 100644
--- a/committee-rails.gemspec
+++ b/committee-rails.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
-  spec.add_dependency 'committee', '>= 3.0.0'
+  spec.add_dependency 'committee', '>= 4.4.0'
   spec.add_dependency 'activesupport'
   spec.add_dependency 'actionpack'
   spec.add_dependency 'railties'
diff --git a/lib/committee/rails/version.rb b/lib/committee/rails/version.rb
index 49d8991..64392ba 100644
--- a/lib/committee/rails/version.rb
+++ b/lib/committee/rails/version.rb
@@ -1,5 +1,5 @@
 module Committee
   module Rails
-    VERSION = "0.5.1"
+    VERSION = "0.6.0"
   end
 end