diff --git a/VERSION b/VERSION
index 3eefcb9..1d0ba9e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.0
+0.4.0
diff --git a/json-canonicalization.gemspec b/json-canonicalization.gemspec
index c09b2d0..61a9ba2 100755
--- a/json-canonicalization.gemspec
+++ b/json-canonicalization.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |gem|
   gem.files                 = %w(AUTHORS README.md LICENSE VERSION) + Dir.glob('lib/**/*.rb')
   gem.test_files            = Dir.glob('spec/**/*.rb') + Dir.glob('spec/**/*.json')
 
-  gem.required_ruby_version = '>= 3.0'
+  gem.required_ruby_version = '>= 2.6'
   gem.requirements          = []
   gem.add_development_dependency 'rspec',           '~> 3.12'
   gem.add_development_dependency 'yard' ,           '~> 0.9'