diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09f118c..5b709a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
 ## [3.0.9] - 2024-01-09
 ### Fixed
 - expired MFA code verification 
diff --git a/src/SmsapiClient.php b/src/SmsapiClient.php
index c40e21a..564843f 100644
--- a/src/SmsapiClient.php
+++ b/src/SmsapiClient.php
@@ -12,7 +12,7 @@
  */
 interface SmsapiClient extends LoggerAwareInterface
 {
-    const VERSION = '3.0.9';
+    const VERSION = 'Unreleased';
 
     public function smsapiPlService(string $apiToken): SmsapiPlService;
 
diff --git a/tests/Unit/Infrastructure/ResponseMapper/RestResponseMapperTest.php b/tests/Unit/Infrastructure/ResponseMapper/RestResponseMapperTest.php
index dfbb087..9419e90 100644
--- a/tests/Unit/Infrastructure/ResponseMapper/RestResponseMapperTest.php
+++ b/tests/Unit/Infrastructure/ResponseMapper/RestResponseMapperTest.php
@@ -92,6 +92,18 @@ public function it_should_throw_exception_on_service_unavailable()
         $this->restResponseMapper->map($responseWithServiceUnavailable);
     }
 
+    /**
+     * @test
+     */
+    public function it_should_throw_exception_on_request_timeout()
+    {
+        $responseWithServiceUnavailable = new Response(ResponseHttpCode::REQUEST_TIMEOUT);
+
+        $this->expectException(ApiErrorException::class);
+        $this->expectExceptionMessage("Request timed out");
+        $this->restResponseMapper->map($responseWithServiceUnavailable);
+    }
+
     /**
      * @test
      */