diff --git a/.changeset/hip-experts-wink.md b/.changeset/hip-experts-wink.md
deleted file mode 100644
index 18b7d61..0000000
--- a/.changeset/hip-experts-wink.md
+++ /dev/null
@@ -1,5 +0,0 @@
----
-"fingerprint-pro-server-api-php-sdk": patch
----
-
-Mark nullable types as an optional, will fix #123
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d7aabc..ab3387d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Fingerprint Pro Server PHP SDK
 
+## 5.1.1
+
+### Patch Changes
+
+- Mark nullable types as an optional, will fix #123 ([9e8f44a](https://github.com/fingerprintjs/fingerprint-pro-server-api-php-sdk/commit/9e8f44a01cd78edbbbd8b480753a63673b723c30))
+
 ## 5.1.0
 
 ### Minor Changes
diff --git a/README.md b/README.md
index 3da896d..05e6aeb 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@
 This PHP package is automatically generated by the [Swagger Codegen](https://github.com/swagger-api/swagger-codegen) project:
 
 - API version: 3
-    - Package version: 5.1.0
+    - Package version: 5.1.1
 - Build package: io.swagger.codegen.v3.generators.php.PhpClientCodegen
 
 ## Requirements
diff --git a/composer.json b/composer.json
index 5d2cd65..35b5d21 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "fingerprint/fingerprint-pro-server-api-sdk",
-    "version": "5.1.0",
+    "version": "5.1.1",
     "description": "Fingerprint Pro Server API provides a way for validating visitors’ data issued by Fingerprint Pro.",
     "keywords": [
         "swagger",
diff --git a/config.json b/config.json
index 22f6428..fbf4133 100644
--- a/config.json
+++ b/config.json
@@ -8,5 +8,5 @@
   "gitUserId": "fingerprintjs",
   "gitRepoId": "fingerprint-pro-server-api-php-sdk",
   "description": "Fingerprint Pro Server API provides a way for validating visitors’ data issued by Fingerprint Pro.",
-  "artifactVersion": "5.1.0"
+  "artifactVersion": "5.1.1"
 }
diff --git a/package.json b/package.json
index 8dc9e48..e2be323 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fingerprint-pro-server-api-php-sdk",
-  "version": "5.1.0",
+  "version": "5.1.1",
   "private": true,
   "devDependencies": {
     "@changesets/cli": "^2.27.8",
diff --git a/src/Api/FingerprintApi.php b/src/Api/FingerprintApi.php
index 4411f48..6ba500b 100644
--- a/src/Api/FingerprintApi.php
+++ b/src/Api/FingerprintApi.php
@@ -57,7 +57,7 @@ class FingerprintApi
     protected ClientInterface $client;
     protected Configuration $config;
 
-    protected string $integration_info = 'fingerprint-pro-server-php-sdk/5.1.0';
+    protected string $integration_info = 'fingerprint-pro-server-php-sdk/5.1.1';
 
     public function __construct(
         ?ClientInterface $client = null,
diff --git a/src/Configuration.php b/src/Configuration.php
index 9b007b4..eb95396 100644
--- a/src/Configuration.php
+++ b/src/Configuration.php
@@ -81,7 +81,7 @@ class Configuration
     /**
      * User agent of the HTTP request, set to "PHP-Swagger" by default.
      */
-    protected string $userAgent = 'Swagger-Codegen/5.1.0/php';
+    protected string $userAgent = 'Swagger-Codegen/5.1.1/php';
 
     /**
      * Debug switch (default set to false).
@@ -422,7 +422,7 @@ public static function toDebugReport(): string
         $report .= '    OS: '.php_uname().PHP_EOL;
         $report .= '    PHP Version: '.PHP_VERSION.PHP_EOL;
         $report .= '    OpenAPI Spec Version: 3'.PHP_EOL;
-        $report .= '    SDK Package Version: 5.1.0'.PHP_EOL;
+        $report .= '    SDK Package Version: 5.1.1'.PHP_EOL;
         $report .= '    Temp Folder Path: '.self::getDefaultConfiguration()->getTempFolderPath().PHP_EOL;
 
         return $report;