diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index a769f55ebd2b0..eaa33968a5f9e 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -186,9 +186,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>38017c3935de95d0335bac04f4901ddfc2718656</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.0-alpha.1.20527.2">
+    <Dependency Name="Microsoft.NET.ILLink.Tasks" Version="6.0.0-alpha.1.20555.2">
       <Uri>https://github.com/mono/linker</Uri>
-      <Sha>57974c1f5790e6fb33f5fce161707be5cd86c4d3</Sha>
+      <Sha>b8e2a581c7e1ebc1b98081aa7a5474521b7351f9</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="1.0.0-prerelease.20530.4">
       <Uri>https://github.com/dotnet/xharness</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index bbe08d36868e7..ceb818e870a03 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -149,7 +149,7 @@
     <!-- Docs -->
     <MicrosoftPrivateIntellisenseVersion>5.0.0-preview-20201009.2</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->
-    <MicrosoftNETILLinkTasksVersion>6.0.0-alpha.1.20527.2</MicrosoftNETILLinkTasksVersion>
+    <MicrosoftNETILLinkTasksVersion>6.0.0-alpha.1.20555.2</MicrosoftNETILLinkTasksVersion>
     <!-- ICU -->
     <MicrosoftNETCoreRuntimeICUTransportVersion>6.0.0-alpha.1.20526.1</MicrosoftNETCoreRuntimeICUTransportVersion>
     <!-- Mono LLVM -->
diff --git a/eng/illink.targets b/eng/illink.targets
index d8aea8234e3d7..b274575178469 100644
--- a/eng/illink.targets
+++ b/eng/illink.targets
@@ -231,6 +231,8 @@
       <ILLinkArgs>$(ILLinkArgs) --skip-unresolved true</ILLinkArgs>
       <!-- keep interface implementations -->
       <ILLinkArgs>$(ILLinkArgs) --disable-opt unusedinterfaces</ILLinkArgs>
+      <!-- keep any type check -->
+      <ILLinkArgs>$(ILLinkArgs) --disable-opt unusedtypechecks</ILLinkArgs>
     </PropertyGroup>
   </Target>