diff --git a/lib/marsh_grass/version.rb b/lib/marsh_grass/version.rb
index 9840f94..ad288e7 100644
--- a/lib/marsh_grass/version.rb
+++ b/lib/marsh_grass/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module MarshGrass
-  VERSION = '0.3.0'
+  VERSION = '0.4.0'
 end
diff --git a/marsh_grass.gemspec b/marsh_grass.gemspec
index 921a95c..209a399 100644
--- a/marsh_grass.gemspec
+++ b/marsh_grass.gemspec
@@ -35,6 +35,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_dependency 'activesupport', '>= 7.1', '< 9.0'
   spec.add_dependency 'rspec', '~> 3.6'
-  spec.add_dependency 'rspec-rails', '~> 6'
+  spec.add_dependency 'rspec-rails', '>= 6', '< 9'
   spec.add_dependency 'timecop', '~> 0.9'
 end