diff --git a/EnumerableAsyncProcessor/EnumerableAsyncProcessor.csproj b/EnumerableAsyncProcessor/EnumerableAsyncProcessor.csproj
index 77036de..290f09a 100644
--- a/EnumerableAsyncProcessor/EnumerableAsyncProcessor.csproj
+++ b/EnumerableAsyncProcessor/EnumerableAsyncProcessor.csproj
@@ -32,7 +32,7 @@
     </ItemGroup>
     
     <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-        <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
+        <PackageReference Include="System.Collections.Immutable" Version="9.0.0" />
         <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.0" />
         <PackageReference Include="morelinq" Version="4.3.0" />