diff --git a/src/StructLinq.BCL/StructLinq.BCL.csproj b/src/StructLinq.BCL/StructLinq.BCL.csproj
index ce876b1f..ab59c060 100644
--- a/src/StructLinq.BCL/StructLinq.BCL.csproj
+++ b/src/StructLinq.BCL/StructLinq.BCL.csproj
@@ -22,7 +22,7 @@
     <PackageReference Include="InlineIL.Fody" Version="1.6.0">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="System.Collections.Immutable" Version="1.3.0" />
+    <PackageReference Include="System.Collections.Immutable" Version="5.0.0" />
   </ItemGroup>
 
 </Project>