diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..fe53757
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,13 @@
+version: 2.1
+jobs:
+  build:
+    docker:
+      - image: ruby:3.1.3
+    steps:
+      - checkout
+      - run:
+          name: Run the default task
+          command: |
+            gem install bundler -v 2.4.10
+            bundle install
+            bundle exec rake
diff --git a/test/lib/wire_client/providers/abstract/wire_batch_test.rb b/test/lib/wire_client/providers/abstract/wire_batch_test.rb
index 123d0b2..8ace942 100644
--- a/test/lib/wire_client/providers/abstract/wire_batch_test.rb
+++ b/test/lib/wire_client/providers/abstract/wire_batch_test.rb
@@ -1,7 +1,7 @@
 require 'test_helper'
 
 class AbstractProvider
-  class AbstractWireBatchTest < MiniTest::Test
+  class AbstractWireBatchTest < Minitest::Test
     def test_abstractfulness
       assert_raises(AbstractMethodError) do
         WireClient::Abstract::WireBatch.new(
diff --git a/test/lib/wire_client/providers/sftp/wire_credit_batch_test.rb b/test/lib/wire_client/providers/sftp/wire_credit_batch_test.rb
index a7e5ff4..a1c14d2 100644
--- a/test/lib/wire_client/providers/sftp/wire_credit_batch_test.rb
+++ b/test/lib/wire_client/providers/sftp/wire_credit_batch_test.rb
@@ -1,7 +1,7 @@
 require 'test_helper'
 
 class SftpProvider
-  class WireCreditBatchTest < MiniTest::Test
+  class WireCreditBatchTest < Minitest::Test
     def conn_info
       lambda do |host, username, options|
         assert_equal WireClient::HSBC.host, host
diff --git a/test/lib/wire_client/providers/sftp/wire_debit_batch_test.rb b/test/lib/wire_client/providers/sftp/wire_debit_batch_test.rb
index 9fdb953..51427a8 100644
--- a/test/lib/wire_client/providers/sftp/wire_debit_batch_test.rb
+++ b/test/lib/wire_client/providers/sftp/wire_debit_batch_test.rb
@@ -1,7 +1,7 @@
 require 'test_helper'
 
 class SftpProvider
-  class WireDebitBatchTest < MiniTest::Test
+  class WireDebitBatchTest < Minitest::Test
     def eur_debit_batch
       sample = WireClient::HSHNordbankHamburg::WireBatch.new(
         transaction_type: WireClient::TransactionTypes::Debit
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 1702a6e..cd32dad 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -27,7 +27,7 @@
 
 require 'wire_client'
 
-module MiniTest::Assertions
+module Minitest::Assertions
   def assert_valid_values(klass, values:, attributes:)
     attributes.each do |attribute|
       values.each do |value|