diff --git a/README.md b/README.md
index caa59d9..2e54169 100644
--- a/README.md
+++ b/README.md
@@ -93,9 +93,6 @@ Global migrations can still be created with the `--no-shards` option.
 
 * `1.5.x` targets Mongoid >= `5.0` and Rails >= `4.2`
 * `1.4.x` targets Mongoid >= `4.0` and Rails >= `4.2`
-* `1.3.x` targets Mongoid >= `4.0` and Rails >= `4.2`
-* `1.2.x` targets Mongoid >= `4.0` and Rails >= `4.2`
-* `1.1.x` targets Mongoid >= `4.0` and Rails >= `4.2`
 * `1.0.0` targers Mongoid >= `3.0` and Rails >= `3.2`
 * `0.0.14` targets Mongoid >= `2.0` and Rails >= `3.0` (but < `3.2`)
 
@@ -103,16 +100,18 @@ Global migrations can still be created with the `--no-shards` option.
 
 ## Unreleased
 
+* Remove unnecessary purge, setup, reset, etc. rake tasks because they are already defined by Mongoid (#60)
+* Minor tests improvements
+
 ## 1.5.0
 _26/03/2021_
-[Compare master with 1.4.0](https://github.com/adacosta/mongoid_rails_migrations/compare/v1.4.0...master)
+[Compare master with 1.5.0](https://github.com/adacosta/mongoid_rails_migrations/compare/v1.5.0...master)
 * Add support of multi databases
 * Shards migrations can now be stored in a `shards` subfolder inside the migration folder
 * All Rake tasks now support a custom client with the `MONGOID_CLIENT_NAME` environment variable
 
 ## 1.4.0
 _08/01/2021_
-[Compare master with 1.3.0](https://github.com/adacosta/mongoid_rails_migrations/compare/v1.3.0...master)
 * The hook `after_migrate` can be use when migration crash (#56)
 
 ## 1.3.0
diff --git a/lib/mongoid_rails_migrations/active_record_ext/migrations.rb b/lib/mongoid_rails_migrations/active_record_ext/migrations.rb
index 89b031d..2eb4eab 100644
--- a/lib/mongoid_rails_migrations/active_record_ext/migrations.rb
+++ b/lib/mongoid_rails_migrations/active_record_ext/migrations.rb
@@ -103,7 +103,6 @@ def migrate(direction)
       # it is safe for the call to proceed.
       def singleton_method_added(sym) #:nodoc:
         return if defined?(@ignore_new_methods) && @ignore_new_methods
-
         begin
           @ignore_new_methods = true
 
@@ -154,24 +153,11 @@ def suppress_messages
       def connection
         # ActiveRecord::Base.connection
         if ENV['MONGOID_CLIENT_NAME']
-          Migrator.with_mongoid_client(ENV['MONGOID_CLIENT_NAME']) do
-            Mongoid.client(Mongoid::Threaded.client_override)
-          end
+          Mongoid.client(ENV['MONGOID_CLIENT_NAME'])
         else
           Mongoid.default_client
         end
       end
-
-      def method_missing(method, *arguments, &block)
-        arg_list = arguments.map(&:inspect) * ', '
-
-        say_with_time "#{method}(#{arg_list})" do
-          # unless arguments.empty? || method == :execute
-          #   arguments[0] = Migrator.proper_table_name(arguments.first)
-          # end
-          connection.send(method, *arguments, &block)
-        end
-      end
     end
   end
 
diff --git a/lib/mongoid_rails_migrations/mongoid_ext/railties/database.rake b/lib/mongoid_rails_migrations/mongoid_ext/railties/database.rake
index cecf39e..ad484e0 100644
--- a/lib/mongoid_rails_migrations/mongoid_ext/railties/database.rake
+++ b/lib/mongoid_rails_migrations/mongoid_ext/railties/database.rake
@@ -1,4 +1,14 @@
 namespace :db do
+  if Rake::Task.task_defined?("db:drop")
+    Rake::Task["db:drop"].clear
+  end
+
+  desc 'Drops the database for the current Mongoid client'
+  task :drop => :environment do
+    # Unlike Mongoid's default, this implementation supports the MONGOID_CLIENT_NAME override
+    Mongoid::Migration.connection.database.drop
+  end
+
   desc 'Current database version'
   task :version => :environment do
     puts Mongoid::Migrator.current_version.to_s
diff --git a/test/helper.rb b/test/helper.rb
index 7563493..bab23c6 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -11,7 +11,7 @@
 MIGRATIONS_ROOT = 'test/migrations'
 
 Mongoid.configure.load!("#{__dir__}/mongoid.yml", 'test')
-require 'models/survey_schema'
+require_relative 'models/survey_schema'
 
 module TestMongoidRailsMigrations
   class Application < Rails::Application; end
@@ -19,6 +19,9 @@ class Application < Rails::Application; end
 
 TestMongoidRailsMigrations::Application.load_tasks
 
+# Mongo debug log
+# Mongo::Logger.logger = Logger.new(STDOUT)
+
 # Hide task output
 class Mongoid::Migration
   def self.puts _
diff --git a/test/migration_test.rb b/test/migration_test.rb
index eb50b39..90512a0 100644
--- a/test/migration_test.rb
+++ b/test/migration_test.rb
@@ -4,11 +4,8 @@ module Mongoid
   class TestCase < Minitest::Test #:nodoc:
 
     def setup
-      Mongoid::Migration.verbose = true
-      Mongo::Logger.logger.level = 1
-      # same as db:drop command in lib/mongoid_rails_migrations/mongoid_ext/railties/database.rake
       invoke("db:drop")
-      Mongoid::Migrator.with_mongoid_client("shard1") do
+      with_env("MONGOID_CLIENT_NAME" => "shard1") do
         invoke("db:drop")
       end
     end
diff --git a/test/tasks/task_test_base.rb b/test/tasks/task_test_base.rb
index 9fa0e56..8500294 100644
--- a/test/tasks/task_test_base.rb
+++ b/test/tasks/task_test_base.rb
@@ -1,4 +1,4 @@
-require 'helper'
+require_relative '../helper'
 
 load 'lib/mongoid_rails_migrations/mongoid_ext/railties/database.rake'
 
diff --git a/test/tasks/version_task_test.rb b/test/tasks/version_task_test.rb
index 83114e8..5ba7f0e 100644
--- a/test/tasks/version_task_test.rb
+++ b/test/tasks/version_task_test.rb
@@ -20,13 +20,15 @@ def test_multidatabase_version
       assert_output("0\n") { invoke("db:version") }
     end
 
-    def test_multidatabase_version_with_target_client
+    def test_multidatabase_version_with_target_client_and_rollback
       Mongoid::Migrator.migrations_path = [MIGRATIONS_ROOT + "/multi_shards"]
       with_env("MONGOID_CLIENT_NAME" => "shard1") do
         assert_output("0\n") { invoke("db:version") }
         invoke("db:migrate")
         assert_output("20210210125532\n") { invoke("db:version") }
-        invoke("db:drop")
+        invoke("db:rollback")
+        assert_output("20210210124656\n") { invoke("db:version") }
+        invoke("db:rollback")
         assert_output("0\n") { invoke("db:version") }
       end
     end