diff --git a/AUTHORS.md b/AUTHORS.md
index e590a1f..21b661d 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -24,3 +24,4 @@ Redis Session Store authors
 - Peter Karman
 - Zach Margolis
 - Zachary Belzer
+- Yutaka Kamei
diff --git a/redis-session-store.gemspec b/redis-session-store.gemspec
index 178b70a..44f0ad7 100644
--- a/redis-session-store.gemspec
+++ b/redis-session-store.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |gem|
   gem.version = File.read('lib/redis-session-store.rb')
                     .match(/^  VERSION = '(.*)'/)[1]
 
-  gem.add_runtime_dependency 'actionpack', '>= 3', '< 8'
+  gem.add_runtime_dependency 'actionpack', '>= 6', '< 8'
   gem.add_runtime_dependency 'redis', '>= 3', '< 5'
 
   gem.add_development_dependency 'fakeredis', '~> 0.8'