diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4af68315b..96eadb738 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
# DocuSign C# Client Changelog
+## [v10.0.0] - eSignature API v2.1-26.2.00.00 - 2026-06-01
+### Changed
+- Added support for version v2.1-26.2.00.00 of the DocuSign ESignature API.
+- Updated the SDK release version.
+
## [v9.0.0] - eSignature API v2.1-26.1.02.00 - 2026-05-04
### Removed
- Removed the deprecated `ListRecipientNamesByEmail` endpoint (`/v2.1/accounts/{accountId}/recipient_names`).
diff --git a/README.md b/README.md
index 113f15fba..c5befaf93 100755
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ This client SDK is provided as open source, which enables you to customize its f
### Version Information
- **API version**: v2.1
-- **Latest SDK version (Including prerelease)**: 9.0.0
+- **Latest SDK version (Including prerelease)**: 10.0.0
### Requirements
diff --git a/sdk/DocuSign.eSign.sln b/sdk/DocuSign.eSign.sln
index 695bdcf5d..a98f88d1d 100644
--- a/sdk/DocuSign.eSign.sln
+++ b/sdk/DocuSign.eSign.sln
@@ -2,7 +2,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 2012
VisualStudioVersion = 12.0.0.0
MinimumVisualStudioVersion = 10.0.0.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DocuSign.eSign", "src\DocuSign.eSign\DocuSign.eSign.csproj", "{7D2E85BD-F5BE-450C-A6C9-00DF5A133FD7}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DocuSign.eSign", "src\DocuSign.eSign\DocuSign.eSign.csproj", "{F790A71F-1180-4AF0-97EB-B72D3068C3FD}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -10,10 +10,10 @@ Global
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
- {7D2E85BD-F5BE-450C-A6C9-00DF5A133FD7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
- {7D2E85BD-F5BE-450C-A6C9-00DF5A133FD7}.Debug|Any CPU.Build.0 = Debug|Any CPU
- {7D2E85BD-F5BE-450C-A6C9-00DF5A133FD7}.Release|Any CPU.ActiveCfg = Release|Any CPU
- {7D2E85BD-F5BE-450C-A6C9-00DF5A133FD7}.Release|Any CPU.Build.0 = Release|Any CPU
+ {F790A71F-1180-4AF0-97EB-B72D3068C3FD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {F790A71F-1180-4AF0-97EB-B72D3068C3FD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {F790A71F-1180-4AF0-97EB-B72D3068C3FD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {F790A71F-1180-4AF0-97EB-B72D3068C3FD}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
diff --git a/sdk/src/DocuSign.eSign/Api/EnvelopesApi.cs b/sdk/src/DocuSign.eSign/Api/EnvelopesApi.cs
index af170b4b1..a3128506d 100644
--- a/sdk/src/DocuSign.eSign/Api/EnvelopesApi.cs
+++ b/sdk/src/DocuSign.eSign/Api/EnvelopesApi.cs
@@ -1105,6 +1105,56 @@ public interface IEnvelopesApi : IApiAccessor
/// ApiResponse of Object(void)
ApiResponse