diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2385bbd..e17b6ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## Version 7.38.0 - 2026-10-14
+
+### Added
+
+- Added nullable isScheduledTask and state to `Activity`.
+
 ## Version 7.37.0 - 2026-10-09
 
 ### Added
diff --git a/src/ONE.Interfaces.ProtocolBuffers b/src/ONE.Interfaces.ProtocolBuffers
index e7b94a6..af58724 160000
--- a/src/ONE.Interfaces.ProtocolBuffers
+++ b/src/ONE.Interfaces.ProtocolBuffers
@@ -1 +1 @@
-Subproject commit e7b94a6bb860d38d702755eced7c3c5529f33564
+Subproject commit af587243956b5e414a6e02de4ba9fa2d5effdd67
diff --git a/src/ONE.Models.CSharp/ONE.Models.CSharp.csproj b/src/ONE.Models.CSharp/ONE.Models.CSharp.csproj
index 0ea126e..9e7ccc1 100644
--- a/src/ONE.Models.CSharp/ONE.Models.CSharp.csproj
+++ b/src/ONE.Models.CSharp/ONE.Models.CSharp.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <!--For Release packages update
     the VersionPrefix and remove any VersionSuffix-->
-    <VersionPrefix>7.37.0</VersionPrefix>
+    <VersionPrefix>7.38.0</VersionPrefix>
     <!--For Feature packages update the VersionSuffix with the jira ticket number-->
     <VersionSuffix></VersionSuffix>
     <LangVersion>latest</LangVersion>