diff --git a/.speakeasy/gen.lock b/.speakeasy/gen.lock
index 182b081f..7521e7ea 100755
--- a/.speakeasy/gen.lock
+++ b/.speakeasy/gen.lock
@@ -3,10 +3,10 @@ id: 0b9e0548-6a63-426d-aa19-95795ea55543
 management:
   docChecksum: bb72b9e5f65512abfc137f36f5e4fd02
   docVersion: v2.1.0-beta.1
-  speakeasyVersion: 1.396.6
-  generationVersion: 2.415.6
-  releaseVersion: 2.4.3
-  configChecksum: 221f5b331bd74c2fff718348be503491
+  speakeasyVersion: 1.397.2
+  generationVersion: 2.415.8
+  releaseVersion: 2.4.4
+  configChecksum: 5adfaeec7fb402586c121cc62fabd10a
   repoURL: https://github.com/formancehq/formance-sdk-php.git
   repoSubDirectory: .
   installationURL: https://github.com/formancehq/formance-sdk-php
@@ -24,7 +24,7 @@ features:
     nameOverrides: 2.81.2
     nullables: 1.0.0
     responseFormat: 0.1.0
-    unions: 0.1.1
+    unions: 0.1.2
 generatedFiles:
   - .gitattributes
   - CONTRIBUTING.md
diff --git a/RELEASES.md b/RELEASES.md
index b3a83e24..827b59e1 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -228,4 +228,14 @@ Based on:
 ### Generated
 - [php v2.4.3] .
 ### Releases
-- [Composer v2.4.3] https://packagist.org/packages/formance/formance-sdk#v2.4.3 - .
\ No newline at end of file
+- [Composer v2.4.3] https://packagist.org/packages/formance/formance-sdk#v2.4.3 - .
+
+## 2024-09-16 16:06:18
+### Changes
+Based on:
+- OpenAPI Doc v2.1.0-beta.1 
+- Speakeasy CLI 1.397.2 (2.415.8) https://github.com/speakeasy-api/speakeasy
+### Generated
+- [php v2.4.4] .
+### Releases
+- [Composer v2.4.4] https://packagist.org/packages/formance/formance-sdk#v2.4.4 - .
\ No newline at end of file
diff --git a/gen.yaml b/gen.yaml
index 34b0f527..cdcc3429 100755
--- a/gen.yaml
+++ b/gen.yaml
@@ -12,7 +12,7 @@ generation:
   comments: {}
   telemetryEnabled: false
 php:
-  version: 2.4.3
+  version: 2.4.4
   clientServerStatusCodesAsErrors: true
   flattenGlobalSecurity: true
   imports:
diff --git a/src/SDKConfiguration.php b/src/SDKConfiguration.php
index 6d9ef095..64a5c162 100644
--- a/src/SDKConfiguration.php
+++ b/src/SDKConfiguration.php
@@ -27,11 +27,11 @@ class SDKConfiguration
 
     public string $openapiDocVersion = 'v2.1.0-beta.1';
 
-    public string $sdkVersion = '2.4.3';
+    public string $sdkVersion = '2.4.4';
 
-    public string $genVersion = '2.415.6';
+    public string $genVersion = '2.415.8';
 
-    public string $userAgent = 'speakeasy-sdk/php 2.4.3 2.415.6 v2.1.0-beta.1 formance/formance-sdk';
+    public string $userAgent = 'speakeasy-sdk/php 2.4.4 2.415.8 v2.1.0-beta.1 formance/formance-sdk';
 
     public function getServerUrl(): string
     {
diff --git a/src/Utils/UnionHandler.php b/src/Utils/UnionHandler.php
index fd60c395..d7a1f105 100644
--- a/src/Utils/UnionHandler.php
+++ b/src/Utils/UnionHandler.php
@@ -73,14 +73,26 @@ public function serializeUnion(
             return $this->matchSimpleType($data, $type, $context);
         } else {
             if (is_array($data)) {
-                $innerType = gettype($data[0]);
-                if ($innerType === 'object') {
-                    $innerType = get_class($data[0]);
+                if (array_is_list($data) && ! empty($data)) {
+                    $innerType = gettype($data[0]);
+                    if ($innerType === 'object') {
+                        $innerType = get_class($data[0]);
+                    }
+                    $resolvedType = [
+                        'name' => 'array',
+                        'params' => ['name' => $innerType, 'params' => []],
+                    ];
+                } else {
+                    $keyType = gettype(array_key_first($data));
+                    $valueType = gettype($data[array_key_first($data)]);
+                    $resolvedType = [
+                        'name' => 'array',
+                        'params' => [
+                            ['name' => $keyType, 'params' => []],
+                            ['name' => $valueType, 'params' => []],
+                        ],
+                    ];
                 }
-                $resolvedType = [
-                    'name' => 'array',
-                    'params' => ['name' => $innerType, 'params' => []],
-                ];
             } else {
                 $resolvedType = null;
                 foreach ($type['params'] as $possibleType) {
@@ -176,6 +188,8 @@ public function deserializeUnion(DeserializationVisitorInterface $visitor, mixed
                 continue;
             } catch (NonFloatCastableTypeException $e) {
                 continue;
+            } catch (RuntimeException $e) {
+                continue;
             }
         }