diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 16c3fe8..850fe6e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
             database-password: 'root'
             database-port: '3306'
             docker-compose-file: 'docker-compose.ci.mysql.yml'
-          - ruby-version: 'jruby-9.4.2.0'
+          - ruby-version: 'jruby-9.3.10.0'
             database-adapter: 'mysql2'
             database-user: 'root'
             database-password: 'root'
@@ -37,7 +37,7 @@ jobs:
             database-password: 'postgres'
             database-port: '5432'
             docker-compose-file: 'docker-compose.ci.postgresql.yml'
-          - ruby-version: 'jruby-9.4.2.0'
+          - ruby-version: 'jruby-9.3.10.0'
             database-adapter: 'postgresql'
             database-user: 'postgres'
             database-password: 'postgres'
diff --git a/lib/payment_test/version.rb b/lib/payment_test/version.rb
index cf9999b..31c0a17 100644
--- a/lib/payment_test/version.rb
+++ b/lib/payment_test/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module PaymentTest
-  VERSION = '3.0.1'
+  VERSION = '2.1.1'
 end
diff --git a/payment_test.gemspec b/payment_test.gemspec
index ba903d7..2b28607 100644
--- a/payment_test.gemspec
+++ b/payment_test.gemspec
@@ -23,6 +23,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'font-awesome-rails'
   s.add_dependency 'jquery-rails', '~> 4.5.1'
   s.add_dependency 'killbill-client'
-  s.add_dependency 'rails', '~> 7.0'
+  s.add_dependency 'rails', '~> 6.1'
   s.add_dependency 'sass-rails'
 end
diff --git a/test/dummy/config/application.rb b/test/dummy/config/application.rb
index 8312562..f7fa7bb 100644
--- a/test/dummy/config/application.rb
+++ b/test/dummy/config/application.rb
@@ -25,7 +25,7 @@
 module Dummy
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 7.0
+    config.load_defaults 6.1
 
     # Configuration for the application, engines, and railties goes here.
     #