diff --git a/README.md b/README.md
index 42f0b8c..cb0ead5 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,16 @@ If you have used the rails generator, you can set the variable to a falsey value
 - "truthy" values: `[1, t, true, y, yes]`
 - "falsey" values: `[0, f, false, n, no]`
 
+### Running tests
+
+To run the tests for all versions, run this script:
+
+``` shell
+bin/test_all_versions
+```
+
+Make sure to use the appropriate Ruby version! ActiveRecord <6.0 is not compatible with Ruby 3, so specs for those versions will only run successfully in a Ruby 2 environment.
+
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/wetransfer/ghost_adapter. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](./CODE_OF_CONDUCT.md).
diff --git a/lib/active_record/connection_adapters/mysql2_ghost_adapter.rb b/lib/active_record/connection_adapters/mysql2_ghost_adapter.rb
index 02c1841..af5e5e7 100644
--- a/lib/active_record/connection_adapters/mysql2_ghost_adapter.rb
+++ b/lib/active_record/connection_adapters/mysql2_ghost_adapter.rb
@@ -18,9 +18,9 @@ def mysql2_ghost_connection(config)
       end
 
       client = Mysql2::Client.new(config)
-      if GhostAdapter::Internal.ghost_migration_enabeld?
-        dry_run = ENV['DRY_RUN'] == '1'
-        GhostAdapter::VersionChecker.validate_executable! unless ENV['SKIP_GHOST_VERSION_CHECK'] == '1'
+      if GhostAdapter::Internal.ghost_migration_enabled?
+        dry_run = ENV.fetch('DRY_RUN', nil) == '1'
+        GhostAdapter::VersionChecker.validate_executable! unless ENV.fetch('SKIP_GHOST_VERSION_CHECK', nil) == '1'
         ConnectionAdapters::Mysql2GhostAdapter.new(client, logger, nil, config, dry_run: dry_run)
       else
         ConnectionAdapters::Mysql2Adapter.new(client, logger, nil, config)
@@ -42,16 +42,29 @@ def initialize(connection, logger, connection_options, config, dry_run: false)
         @dry_run = dry_run
       end
 
-      def execute(sql, name = nil)
-        # Only ALTER TABLE statements are automatically skipped by gh-ost
-        # We need to manually skip CREATE TABLE, DROP TABLE, and
-        # INSERT/DELETE (to schema migrations) for dry runs
-        return if dry_run && should_skip_for_dry_run?(sql)
-
-        if (table, query = parse_sql(sql))
-          GhostAdapter::Migrator.execute(table, query, database, dry_run)
-        else
-          super(sql, name)
+      if Gem.loaded_specs['activerecord'].version >= Gem::Version.new('7.0')
+        def execute(sql, name = nil, async: false)
+          # Only ALTER TABLE statements are automatically skipped by gh-ost
+          # We need to manually skip CREATE TABLE, DROP TABLE, and
+          # INSERT/DELETE (to schema migrations) for dry runs
+          return if dry_run && should_skip_for_dry_run?(sql)
+
+          if (table, query = parse_sql(sql))
+            GhostAdapter::Migrator.execute(table, query, database, dry_run)
+          else
+            super(sql, name, async: async)
+          end
+        end
+      else
+        def execute(sql, name = nil)
+          # See comment above -- some tables need to be skipped manually for dry runs
+          return if dry_run && should_skip_for_dry_run?(sql)
+
+          if (table, query = parse_sql(sql))
+            GhostAdapter::Migrator.execute(table, query, database, dry_run)
+          else
+            super(sql, name)
+          end
         end
       end
 
@@ -80,7 +93,7 @@ def remove_index(table_name, column_name = nil, **options)
         end
       else
         def add_index(table_name, column_name, options = {})
-          index_name, index_type, index_columns, _index_options = add_index_options(table_name, column_name, options)
+          index_name, index_type, index_columns, _index_options = add_index_options(table_name, column_name, **options)
 
           sql = build_add_index_sql(
             table_name, index_columns, index_name,
diff --git a/lib/ghost_adapter.rb b/lib/ghost_adapter.rb
index 9454697..4ca27b2 100644
--- a/lib/ghost_adapter.rb
+++ b/lib/ghost_adapter.rb
@@ -5,7 +5,7 @@
 
 require 'ghost_adapter/config'
 
-require 'ghost_adapter/railtie' if defined? ::Rails::Railtie
+require 'ghost_adapter/railtie' if defined? Rails::Railtie
 
 module GhostAdapter
   def self.config
@@ -43,8 +43,8 @@ def self.enable_ghost_migration!
       @@ghost_migration_enabled = true # rubocop:disable Style/ClassVars
     end
 
-    def self.ghost_migration_enabeld?
-      env_val = ENV['GHOST_MIGRATE']&.downcase
+    def self.ghost_migration_enabled?
+      env_val = ENV.fetch('GHOST_MIGRATE', 'false').downcase
       return false if %w[0 n no f false].include?(env_val)
 
       !!@@ghost_migration_enabled || %w[1 y yes t true].include?(env_val)
diff --git a/lib/ghost_adapter/version.rb b/lib/ghost_adapter/version.rb
index 2b73e9b..9680fdc 100644
--- a/lib/ghost_adapter/version.rb
+++ b/lib/ghost_adapter/version.rb
@@ -1,3 +1,3 @@
 module GhostAdapter
-  VERSION = '0.4.2'.freeze
+  VERSION = '0.5.0'.freeze
 end
diff --git a/spec/active_record/connection_adapters/mysql2_ghost_adapter_spec.rb b/spec/active_record/connection_adapters/mysql2_ghost_adapter_spec.rb
index baa8d4a..5b7cd25 100644
--- a/spec/active_record/connection_adapters/mysql2_ghost_adapter_spec.rb
+++ b/spec/active_record/connection_adapters/mysql2_ghost_adapter_spec.rb
@@ -27,11 +27,11 @@
     describe 'clean_query' do
       it 'parses query correctly' do
         sql =
-          'ADD index_type INDEX `bar_index_name` (`bar_id`), '\
+          'ADD index_type INDEX `bar_index_name` (`bar_id`), ' \
           'ADD index_type INDEX `baz_index_name` (`baz_id`);;;'
 
         sanatized_sql =
-          'ADD index_type INDEX `bar_index_name` (`bar_id`), '\
+          'ADD index_type INDEX `bar_index_name` (`bar_id`), ' \
           'ADD index_type INDEX `baz_index_name` (`baz_id`)'
 
         expect(GhostAdapter::Migrator).to receive(:execute)