diff --git a/src/Sharpy.Core/Sharpy.Core.csproj b/src/Sharpy.Core/Sharpy.Core.csproj
index 97800c008..5217d185d 100644
--- a/src/Sharpy.Core/Sharpy.Core.csproj
+++ b/src/Sharpy.Core/Sharpy.Core.csproj
@@ -32,7 +32,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Collections.Immutable" Version="10.0.12" />
+    <PackageReference Include="System.Collections.Immutable" Version="10.0.13" />
     <!-- Async interfaces for IAsyncEnumerable<T>, IAsyncDisposable (Phase 10 prep) -->
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.12" Condition="'$(TargetFramework)' == 'netstandard2.1'" />
   </ItemGroup>