diff --git a/tests/Monolog/Handler/Slack/SlackRecordTest.php b/tests/Monolog/Handler/Slack/SlackRecordTest.php
index d6c6c229..c9a3c7e5 100644
--- a/tests/Monolog/Handler/Slack/SlackRecordTest.php
+++ b/tests/Monolog/Handler/Slack/SlackRecordTest.php
@@ -12,7 +12,7 @@
 namespace Monolog\Handler\Slack;
 
 use Monolog\Logger;
-use Monolog\TestCase;
+use Monolog\Test\TestCase;
 
 /**
  * @coversDefaultClass Monolog\Handler\Slack\SlackRecord
diff --git a/tests/Monolog/Handler/SlackWebhookHandlerTest.php b/tests/Monolog/Handler/SlackWebhookHandlerTest.php
index cc9b7bab..3c464b6b 100644
--- a/tests/Monolog/Handler/SlackWebhookHandlerTest.php
+++ b/tests/Monolog/Handler/SlackWebhookHandlerTest.php
@@ -11,7 +11,7 @@
 
 namespace Monolog\Handler;
 
-use Monolog\TestCase;
+use Monolog\Test\TestCase;
 use Monolog\Logger;
 use Monolog\Formatter\LineFormatter;
 use Monolog\Handler\Slack\SlackRecord;
diff --git a/tests/Monolog/Handler/SlackbotHandlerTest.php b/tests/Monolog/Handler/SlackbotHandlerTest.php
index b1b02bde..a5227120 100644
--- a/tests/Monolog/Handler/SlackbotHandlerTest.php
+++ b/tests/Monolog/Handler/SlackbotHandlerTest.php
@@ -11,7 +11,7 @@
 
 namespace Monolog\Handler;
 
-use Monolog\TestCase;
+use Monolog\Test\TestCase;
 use Monolog\Logger;
 
 /**