diff --git a/src/X.Spectator/X.Spectator.csproj b/src/X.Spectator/X.Spectator.csproj
old mode 100755
new mode 100644
index 033c4ef..1e46168
--- a/src/X.Spectator/X.Spectator.csproj
+++ b/src/X.Spectator/X.Spectator.csproj
@@ -21,7 +21,7 @@
 
     <ItemGroup>
       <PackageReference Include="JetBrains.Annotations" Version="2019.1.1" />
-      <PackageReference Include="System.Collections.Immutable" Version="1.5.0" />
+      <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
     </ItemGroup>
 
 </Project>