diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9253d19..a376f30 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,9 @@ 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 `EnvelopeProperties.timestampsEnabled` property
 
 ## [2.11.0] - 2025-11-12
 ### Deprecated
diff --git a/src/Resource/AccountBilling.php b/src/Resource/AccountBilling.php
index 4aae3d1..c53f27c 100644
--- a/src/Resource/AccountBilling.php
+++ b/src/Resource/AccountBilling.php
@@ -50,6 +50,10 @@ class AccountBilling extends BaseResource
 
     public bool $timestamps;
 
+    public bool $timestampsAtsa;
+
+    public bool $timestampsPostsignum;
+
     public bool $fileCertificates;
 
     public int $fileSizeLimit;
diff --git a/src/Resource/EnvelopeProperties.php b/src/Resource/EnvelopeProperties.php
index a6bbaa5..121b1d8 100644
--- a/src/Resource/EnvelopeProperties.php
+++ b/src/Resource/EnvelopeProperties.php
@@ -48,4 +48,6 @@ class EnvelopeProperties extends BaseResource
 
     /** @var array<string, string>|null */
     public ?array $consumerGuide;
+
+    public bool $timestampsEnabled;
 }
diff --git a/src/Resource/Features.php b/src/Resource/Features.php
index 5848828..e5d1efb 100644
--- a/src/Resource/Features.php
+++ b/src/Resource/Features.php
@@ -9,6 +9,8 @@ class Features extends BaseResource
     public bool $branding;
     public bool $brandingPlus;
     public bool $timestamps;
+    public bool $timestampsAtsa;
+    public bool $timestampsPostsignum;
     public bool $fileCertificates;
     public bool $identify;
     public bool $identifyBankId;