diff --git a/CHANGELOG.md b/CHANGELOG.md
index a376f30..2833bd5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,8 +39,8 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 - Add `EnvelopeWithdrawal` resource
 - Add `query` parameter to `EnvelopesEndpoint.get` method
 - Deprecate `Webhook.event` in favor of `Webhook.events`
-- Add `AccountBilling.timestampsAtsa` and `AccountBilling.timestampsPostignum` property
-- Add `Features.timestampsAtsa` and `Features.timestampsPostignum` property
+- Add `AccountBilling.timestampsAtsa` and `AccountBilling.timestampsPostSignum` property
+- Add `Features.timestampsAtsa` and `Features.timestampsPostSignum` property
 - Add `EnvelopeProperties.timestampsEnabled` property
 
 ## [2.11.0] - 2025-11-12
diff --git a/src/Resource/AccountBilling.php b/src/Resource/AccountBilling.php
index c53f27c..db3bbe8 100644
--- a/src/Resource/AccountBilling.php
+++ b/src/Resource/AccountBilling.php
@@ -52,7 +52,7 @@ class AccountBilling extends BaseResource
 
     public bool $timestampsAtsa;
 
-    public bool $timestampsPostsignum;
+    public bool $timestampsPostSignum;
 
     public bool $fileCertificates;
 
diff --git a/src/Resource/Features.php b/src/Resource/Features.php
index e5d1efb..bf42a96 100644
--- a/src/Resource/Features.php
+++ b/src/Resource/Features.php
@@ -10,7 +10,7 @@ class Features extends BaseResource
     public bool $brandingPlus;
     public bool $timestamps;
     public bool $timestampsAtsa;
-    public bool $timestampsPostsignum;
+    public bool $timestampsPostSignum;
     public bool $fileCertificates;
     public bool $identify;
     public bool $identifyBankId;