diff --git a/csv2db.gemspec b/csv2db.gemspec
index 49124ab..087c5ce 100644
--- a/csv2db.gemspec
+++ b/csv2db.gemspec
@@ -33,11 +33,11 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'activerecord', '>= 4.2', '< 6.2'
-  spec.add_dependency 'activesupport', '>= 4.2', '< 6.2'
+  spec.add_dependency 'activerecord', '>= 4.2', '< 7.1'
+  spec.add_dependency 'activesupport', '>= 4.2', '< 7.1'
   spec.add_dependency 'charlock_holmes', '~> 0.7.3'
   spec.add_dependency 'dragonfly', '~> 1'
-  spec.add_dependency 'railties', '>= 4.2', '< 6.2'
+  spec.add_dependency 'railties', '>= 4.2', '< 7.1'
   spec.add_dependency 'sidekiq', '>= 3'
 
   spec.add_development_dependency 'bundler', '>= 2.2.18', '< 3'