diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00995df..8cb2ce7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Removed
 
 
+## [1.27.0] - 2024-09-10
+[1.27.0]:https://github.com/secucard/secucard-connect-php-sdk/compare/1.26.0...1.27.0
+
+### Added
+- General.ContractsService: new method `updateBankAccount()`
+
+
 ## [1.26.0] - 2023-06-22
 
 ### Deprecated
diff --git a/composer.json b/composer.json
index 54c1b8b..72fb6e3 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
     "description": "secucard connect PHP client SDK",
     "license": "Apache-2.0",
     "homepage": "https://github.com/secucard/secucard-connect-php-sdk",
-    "version": "1.26.0",
+    "version": "1.27.0",
     "require": {
         "php": ">=7.4.0",
         "ext-json": "*",
diff --git a/src/SecucardConnect/Product/General/ContractsService.php b/src/SecucardConnect/Product/General/ContractsService.php
index 473c465..19b041c 100644
--- a/src/SecucardConnect/Product/General/ContractsService.php
+++ b/src/SecucardConnect/Product/General/ContractsService.php
@@ -8,6 +8,7 @@
 use SecucardConnect\Client\ClientError;
 use SecucardConnect\Client\MissingParamsError;
 use SecucardConnect\Client\ProductService;
+use SecucardConnect\Product\General\Model\BankAccount;
 use SecucardConnect\Product\General\Model\PaymentMethodsRequestParams;
 use SecucardConnect\Product\Smart\Model\PaymentWizardContractOptions;
 
@@ -69,4 +70,44 @@ public function revokeAccrual($contractId)
 
         return (bool)$this->execute($contractId, 'revokeAccrual');
     }
+
+    /**
+     * Initiate the update of bank account for the given contract
+     *
+     * @param string $contractId General-Contract-ID, mandatory, f.e. "GCR_..."
+     * @param string $owner bank account owner, mandatory, f.e. "Max Muster"
+     * @param string $iban IBAN, mandatory, f.e. "DE12..."
+     * @param string|null $bic BIC, recommended, depending on the contract settings this param is mandatory or optional
+     * @param string|null $bankname optional
+     * @return bool TRUE if successful, throws ApiError otherwise.
+     * @throws GuzzleException
+     * @throws ApiError
+     * @throws AuthError
+     * @throws ClientError
+     * @throws MissingParamsError
+     */
+    public function updateBankAccount(string $contractId, string $owner, string $iban, ?string $bic = null, ?string $bankname = null)
+    {
+        if (empty($contractId)) {
+            throw new MissingParamsError('contractId', __METHOD__);
+        }
+
+        if (empty($owner)) {
+            throw new MissingParamsError('owner', __METHOD__);
+        }
+
+        if (empty($iban)) {
+            throw new MissingParamsError('iban', __METHOD__);
+        }
+
+        $class = $this->resourceMetadata->resourceClass;
+        $object = new BankAccount(
+            $owner,
+            $iban,
+            $bic,
+            $bankname
+        );
+
+        return (bool)$this->execute($contractId, 'updateBankAccount', null, $object, $class);
+    }
 }
diff --git a/src/SecucardConnect/Product/General/Model/BankAccount.php b/src/SecucardConnect/Product/General/Model/BankAccount.php
new file mode 100644
index 0000000..b572b89
--- /dev/null
+++ b/src/SecucardConnect/Product/General/Model/BankAccount.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace SecucardConnect\Product\General\Model;
+
+/**
+ * Class BankAccount
+ * @package SecucardConnect\Product\General\Model
+ */
+class BankAccount
+{
+    /**
+     * @var string
+     */
+    public string $owner;
+
+    /**
+     * @var string
+     */
+    public string $iban;
+
+    /**
+     * @var string
+     */
+    public string $bic;
+
+    /**
+     * @var string|null
+     */
+    public ?string $bankname;
+
+    /**
+     * CloneParams constructor.
+     * @param string $owner
+     * @param string $iban
+     * @param string $bic
+     * @param string|null $bankname
+     */
+    public function __construct(
+        string $owner,
+        string $iban,
+        string $bic,
+        string $bankname = null
+    ) {
+        $this->owner = $owner;
+        $this->iban = $iban;
+        $this->bic = $bic;
+        $this->bankname = $bankname;
+    }
+}
diff --git a/src/SecucardConnect/SecucardConnect.php b/src/SecucardConnect/SecucardConnect.php
index 6da0f60..bd0fc41 100644
--- a/src/SecucardConnect/SecucardConnect.php
+++ b/src/SecucardConnect/SecucardConnect.php
@@ -33,7 +33,7 @@ final class SecucardConnect
     /**
      * SDK version
      */
-    const VERSION = '1.26.0';
+    const VERSION = '1.27.0';
 
     /**
      * @var OAuthProvider
@@ -109,6 +109,7 @@ public function __construct(
         $this->logger = $logger == null ? new Logger(null, false) : $logger;
 
         $config->isValid();
+        $this->logger->debug('Using config: ' . json_encode($config->toArray(), JSON_PRETTY_PRINT));
         $this->config = $config;
 
         // Create the default common storage if necessary