diff --git a/test/support/assert_called.rb b/test/support/assert_called.rb
index ed2b604..2f49180 100644
--- a/test/support/assert_called.rb
+++ b/test/support/assert_called.rb
@@ -1,6 +1,6 @@
 module AssertCalled
   def assert_called(klass, method, args, return_value = nil)
-    mock = MiniTest::Mock.new
+    mock = Minitest::Mock.new
     mock.expect(:call, return_value, args)
     klass.stub(method, mock) do
       yield
diff --git a/test/test_csv_source.rb b/test/test_csv_source.rb
index d371f43..485d7c1 100644
--- a/test/test_csv_source.rb
+++ b/test/test_csv_source.rb
@@ -3,7 +3,7 @@
 require "kiba-common/sources/csv"
 require_relative "support/test_array_destination"
 
-class TestCSVSource < MiniTest::Test
+class TestCSVSource < Minitest::Test
   TEST_FILENAME = "input.csv"
 
   def setup
diff --git a/test/test_lambda_destination.rb b/test/test_lambda_destination.rb
index e16ee15..0ec655d 100644
--- a/test/test_lambda_destination.rb
+++ b/test/test_lambda_destination.rb
@@ -2,7 +2,7 @@
 require "kiba"
 require "kiba-common/destinations/lambda"
 
-class TestLambdaDestination < MiniTest::Test
+class TestLambdaDestination < Minitest::Test
   def test_lambda
     accumulator = []
     on_init_called = false