diff --git a/Box.V2.Core/Box.V2.Core.csproj b/Box.V2.Core/Box.V2.Core.csproj
index 885cae1e0..9e69a0def 100644
--- a/Box.V2.Core/Box.V2.Core.csproj
+++ b/Box.V2.Core/Box.V2.Core.csproj
@@ -3,14 +3,14 @@
   <PropertyGroup>
     <Description>Box.V2 for .Net Core</Description>
     <AssemblyTitle>Box.V2.Core</AssemblyTitle>
-    <Version>5.2.2</Version>
+    <Version>5.3.0</Version>
     <Authors>Box, Inc.</Authors>
 	<Owners>Box, Inc.</Owners>
 	<PackageProjectUrl>https://github.com/box/box-windows-sdk-v2</PackageProjectUrl>
   <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
 	<PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
 	<PackageDescription>Windows SDK for v2 of the Box API. The SDK is built for .NET Core and includes JWTAuth support.</PackageDescription>
-	<PackageReleaseNotes>See https://github.com/box/box-windows-sdk-v2/blob/main/CHANGELOG.md#522-2023-05-23</PackageReleaseNotes>
+	<PackageReleaseNotes>See https://github.com/box/box-windows-sdk-v2/blob/main/CHANGELOG.md#530-2023-09-04</PackageReleaseNotes>
 	<Copyright>Copyright 2021</Copyright>
 	<PackageTags>Box;V2;SDK;Platform;Enterprise;Collaboration;Storage;File Management</PackageTags>
     <TargetFramework>netstandard2.0</TargetFramework>
diff --git a/Box.V2/Box.V2.nuspec b/Box.V2/Box.V2.nuspec
index a1eea058f..1ffa6d4f1 100644
--- a/Box.V2/Box.V2.nuspec
+++ b/Box.V2/Box.V2.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>Box.V2</id>
-    <version>5.2.2</version>
+    <version>5.3.0</version>
     <title>Box Windows SDK V2</title>
     <authors>Box Inc.</authors>
     <owners>Box Inc.</owners>
@@ -10,7 +10,7 @@
     <license type="expression">Apache-2.0</license>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <description>Windows SDK for v2 of the Box API. The SDK is targeting .NET Framework 4.6.2</description>
-    <releaseNotes>See https://github.com/box/box-windows-sdk-v2/blob/main/CHANGELOG.md#522-2023-05-23</releaseNotes>
+    <releaseNotes>See https://github.com/box/box-windows-sdk-v2/blob/main/CHANGELOG.md#530-2023-09-04</releaseNotes>
     <copyright>Copyright 2021</copyright>
     <tags>Box V2 SDK Platform Enterprise Collaboration Storage File Management</tags>
   </metadata>
diff --git a/Box.V2/Utility/AssemblyInfo.cs b/Box.V2/Utility/AssemblyInfo.cs
index f57564818..f5e06af5f 100644
--- a/Box.V2/Utility/AssemblyInfo.cs
+++ b/Box.V2/Utility/AssemblyInfo.cs
@@ -5,7 +5,7 @@ internal class AssemblyInfo
         public const string AssemblyTitle = "Box.V2";
         public const string AssemblyProduct = "Box.V2";
 
-        public const string NuGetVersion = "5.2.2";
+        public const string NuGetVersion = "5.3.0";
         public const string AssemblyVersion = "1.0.0.0";
         public const string AssemblyFileVersion = "1.0.0.0";
     }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84754deb7..c9d18a713 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [5.3.0](https://github.com/box/box-windows-sdk-v2/compare/v5.2.2...v5.3.0) (2023-09-04)
+
+
+### **New Features and Enhancements:**
+
+* add `attachment` content type to `SignRequestSigner` ([#913](https://github.com/box/box-windows-sdk-v2/issues/913)) ([ad612ff](https://github.com/box/box-windows-sdk-v2/commit/ad612ffc7821a9ecbc180e3dbeefe16d3e397820))
+
+### **Bug Fixes:**
+
+* replace deprecated `BouncyCastle` library ([#909](https://github.com/box/box-windows-sdk-v2/issues/909)) ([f00f2af](https://github.com/box/box-windows-sdk-v2/commit/f00f2af9c5277b42e6a62060c1b0229ecff0203e))
+
+
 ### [5.2.2](https://github.com/box/box-windows-sdk-v2/compare/v5.2.1...v5.2.2) (2023-05-23)
 
 
@@ -384,3 +396,4 @@ All notable changes to this project will be documented in this file. See [standa
 
 
 
+