diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2b2b4fa..fed4b17 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.51.0"
+  ".": "0.52.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c79cfb..b5d18d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.52.0](https://github.com/Increase/increase-csharp/compare/v0.51.0...v0.52.0) (2026-07-13)
+
+
+### Features
+
+* **api:** api update ([#105](https://github.com/Increase/increase-csharp/issues/105)) ([2820cf7](https://github.com/Increase/increase-csharp/commit/2820cf78189190caeb0e85ff0d1e4b0914651240))
+
+
+### Bug Fixes
+
+* **api:** make address country optional, defaulting to US ([43a30a3](https://github.com/Increase/increase-csharp/commit/43a30a31656f1d8811044d3a190b3135f795e413))
+
 ## [0.51.0](https://github.com/Increase/increase-csharp/compare/v0.50.0...v0.51.0) (2026-07-02)
 
 
diff --git a/src/Increase.Api/Increase.Api.csproj b/src/Increase.Api/Increase.Api.csproj
index 3d8dea7..ff97305 100644
--- a/src/Increase.Api/Increase.Api.csproj
+++ b/src/Increase.Api/Increase.Api.csproj
@@ -3,18 +3,18 @@
     <!-- Metadata -->
     <AssemblyTitle>Increase C#</AssemblyTitle>
     <AssemblyName>Increase.Api</AssemblyName>
-    <VersionPrefix>0.51.0</VersionPrefix>
+    <VersionPrefix>0.52.0</VersionPrefix>
     <Description>The official .NET library for the Increase API.</Description>
     <OutputType>Library</OutputType>
     <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
   <ItemGroup>
-    <InternalsVisibleTo Include="Increase.Api.Tests" />
-    <None Include="..\..\README.md" Pack="true" PackagePath="\" />
-    <PackageReference Include="System.Text.Json" Version="9.0.9" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
+    <InternalsVisibleTo Include="Increase.Api.Tests"/>
+    <None Include="..\..\README.md" Pack="true" PackagePath="\"/>
+    <PackageReference Include="System.Text.Json" Version="9.0.9"/>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All"/>
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
+    <PackageReference Include="System.Collections.Immutable" Version="8.0.0"/>
   </ItemGroup>
 </Project>
\ No newline at end of file