diff --git a/src/BitMono.Shared/BitMono.Shared.csproj b/src/BitMono.Shared/BitMono.Shared.csproj
index 908c7e88..8efa0cdd 100644
--- a/src/BitMono.Shared/BitMono.Shared.csproj
+++ b/src/BitMono.Shared/BitMono.Shared.csproj
@@ -20,12 +20,12 @@
 
   <!-- Packages specific to older frameworks that need polyfills -->
   <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">
-    <PackageReference Include="System.Collections.Immutable" Version="1.7.1" />
+    <PackageReference Include="System.Collections.Immutable" Version="10.0.9" />
     <PackageReference Include="PolySharp" Version="1.15.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
-    <PackageReference Include="System.Collections.Immutable" Version="1.7.1"/>
+    <PackageReference Include="System.Collections.Immutable" Version="10.0.9"/>
     <PackageReference Include="PolySharp" Version="1.15.0" />
   </ItemGroup>