diff --git a/composer.json b/composer.json
index 7820b1d..835bee8 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "postfinancecheckout/sdk",
-    "version": "4.2.1",
+    "version": "4.2.2",
 	"description": "PostFinance Checkout SDK for PHP",
 	"keywords": [
 		"postfinancecheckout",
diff --git a/lib/ApiClient.php b/lib/ApiClient.php
index 6a801b4..c96d3b3 100644
--- a/lib/ApiClient.php
+++ b/lib/ApiClient.php
@@ -48,7 +48,7 @@ final class ApiClient {
 	 * @var array
 	 */
 	private $defaultHeaders = [
-        'x-meta-sdk-version' => "4.2.1",
+        'x-meta-sdk-version' => "4.2.2",
         'x-meta-sdk-language' => 'php',
         'x-meta-sdk-provider' => "PostFinance Checkout",
     ];
@@ -58,7 +58,7 @@ final class ApiClient {
 	 *
 	 * @var string
 	 */
-	private $userAgent = 'PHP-Client/4.2.1/php';
+	private $userAgent = 'PHP-Client/4.2.2/php';
 
 	/**
 	 * The path to the certificate authority file.
diff --git a/lib/Configuration.php b/lib/Configuration.php
index bd99765..e1c07fc 100644
--- a/lib/Configuration.php
+++ b/lib/Configuration.php
@@ -80,7 +80,7 @@ class Configuration
      *
      * @var string
      */
-    protected $userAgent = 'PostFinanceCheckout\Sdk/4.2.1/php';
+    protected $userAgent = 'PostFinanceCheckout\Sdk/4.2.2/php';
 
     /**
      * Debug switch (default set to false)
@@ -388,8 +388,8 @@ public static function toDebugReport()
         $report  = 'PHP SDK (PostFinanceCheckout\Sdk) Debug Report:' . PHP_EOL;
         $report .= '    OS: ' . php_uname() . PHP_EOL;
         $report .= '    PHP Version: ' . PHP_VERSION . PHP_EOL;
-        $report .= '    OpenAPI Spec Version: 4.2.1' . PHP_EOL;
-        $report .= '    SDK Package Version: 4.2.1' . PHP_EOL;
+        $report .= '    OpenAPI Spec Version: 4.2.2' . PHP_EOL;
+        $report .= '    SDK Package Version: 4.2.2' . PHP_EOL;
         $report .= '    Temp Folder Path: ' . self::getDefaultConfiguration()->getTempFolderPath() . PHP_EOL;
 
         return $report;
diff --git a/lib/Http/CurlHttpClient.php b/lib/Http/CurlHttpClient.php
index dc575e5..dc8aba7 100644
--- a/lib/Http/CurlHttpClient.php
+++ b/lib/Http/CurlHttpClient.php
@@ -40,8 +40,6 @@ public function isSupported() {
 	public function send(ApiClient $apiClient, HttpRequest $request) {
 		$curl = curl_init();
 
-		$tempCAFile = sys_get_temp_dir() . DIRECTORY_SEPARATOR . "PostFinance Checkout-ca-bundle.crt";
-
 		// set timeout, if needed
 		if ($request->getTimeOut() !== 0) {
 			curl_setopt($curl, CURLOPT_TIMEOUT, $request->getTimeOut());
@@ -61,11 +59,6 @@ public function send(ApiClient $apiClient, HttpRequest $request) {
 		} else {
 			curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
 			curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
-			if (file_exists($tempCAFile)) {
-				// use the temporal CA Bundle if it was set, which indicates a previous error.
-				$apiClient->setCertificateAuthority($tempCAFile);
-				curl_setopt($curl, CURLOPT_CAINFO, $apiClient->getCertificateAuthority());
-			}
 		}
 
 		if ($request->getMethod() === HttpRequest::POST) {
@@ -109,19 +102,8 @@ public function send(ApiClient $apiClient, HttpRequest $request) {
 
 		// Make the request
 		$response = curl_exec($curl);
-		if ($response) {
-			$response = $this->handleResponse($apiClient, $request, $curl, $response, $request->getUrl());
-		} else {
-			// if there was an error, try again with the CA bundle provided by this SDK.
-			$caContent = file_get_contents(__DIR__ . DIRECTORY_SEPARATOR . ".." . DIRECTORY_SEPARATOR . "ca-bundle.crt");
-			file_put_contents($tempCAFile, $caContent);
-
-			// Try again the request, this time with the CA bundle provided by this SDK.
-			$apiClient->setCertificateAuthority($tempCAFile);
-			curl_setopt($curl, CURLOPT_CAINFO, $apiClient->getCertificateAuthority());
-			$response = curl_exec($curl);
-			$response = $this->handleResponse($apiClient, $request, $curl, $response, $request->getUrl());
-		}
+
+		$response = $this->handleResponse($apiClient, $request, $curl, $response, $request->getUrl());
 
 		curl_close($curl);
 		fclose($debugFilePointer);
diff --git a/test/ApiClientTest.php b/test/ApiClientTest.php
index c450861..6346fcb 100644
--- a/test/ApiClientTest.php
+++ b/test/ApiClientTest.php
@@ -144,7 +144,7 @@ public function testSdkHeaders()
         $this->assertGreaterThanOrEqual(4, count($headers));
 
         // Check SDK default header values.
-        $this->assertEquals($headers['x-meta-sdk-version'], "4.2.1");
+        $this->assertEquals($headers['x-meta-sdk-version'], "4.2.2");
         $this->assertEquals($headers['x-meta-sdk-language'], 'php');
         $this->assertEquals($headers['x-meta-sdk-provider'], "PostFinance Checkout");
         $this->assertEquals($headers['x-meta-sdk-language-version'], phpversion());