diff --git a/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs b/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs
index 2b610762164c..602707e29730 100644
--- a/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs
+++ b/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs
@@ -36,6 +36,7 @@ protected AssemblyLoadContext(bool isCollectible) { }
         public void SetProfileOptimizationRoot(string directoryPath) { }
         public void StartProfileOptimization(string profile) { }
         public event Func<AssemblyLoadContext, System.Reflection.AssemblyName, System.Reflection.Assembly> Resolving;
+        public event Func<System.Reflection.Assembly, string, System.IntPtr> ResolvingUnmanagedDll;
         public event Action<AssemblyLoadContext> Unloading;
     }
 
diff --git a/src/System.Runtime.Loader/src/ApiCompatBaseline.netcoreappaot.txt b/src/System.Runtime.Loader/src/ApiCompatBaseline.netcoreappaot.txt
index ea43b226e533..df3278605bf3 100644
--- a/src/System.Runtime.Loader/src/ApiCompatBaseline.netcoreappaot.txt
+++ b/src/System.Runtime.Loader/src/ApiCompatBaseline.netcoreappaot.txt
@@ -2,6 +2,7 @@ Compat issues with assembly System.Runtime.Loader:
 TypesMustExist : Type 'System.Reflection.Metadata.AssemblyExtensions' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext..ctor(System.Boolean)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_Resolving(System.Func<System.Runtime.Loader.AssemblyLoadContext, System.Reflection.AssemblyName, System.Reflection.Assembly>)' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_ResolvingUnmanagedDll(System.Func<System.Reflection.Assembly, System.String, System.IntPtr>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_Unloading(System.Action<System.Runtime.Loader.AssemblyLoadContext>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.Default.get()' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.GetAssemblyName(System.String)' does not exist in the implementation but it does exist in the contract.
@@ -16,9 +17,10 @@ MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.LoadFromStr
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.LoadUnmanagedDll(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.LoadUnmanagedDllFromPath(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_Resolving(System.Func<System.Runtime.Loader.AssemblyLoadContext, System.Reflection.AssemblyName, System.Reflection.Assembly>)' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_ResolvingUnmanagedDll(System.Func<System.Reflection.Assembly, System.String, System.IntPtr>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_Unloading(System.Action<System.Runtime.Loader.AssemblyLoadContext>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.SetProfileOptimizationRoot(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.StartProfileOptimization(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.Unload()' does not exist in the implementation but it does exist in the contract.
 TypesMustExist : Type 'System.Runtime.Loader.AssemblyDependencyResolver' does not exist in the implementation but it does exist in the contract.
-Total Issues: 22
+Total Issues: 24
diff --git a/src/System.Runtime.Loader/src/ApiCompatBaseline.uapaot.txt b/src/System.Runtime.Loader/src/ApiCompatBaseline.uapaot.txt
index ea43b226e533..df3278605bf3 100644
--- a/src/System.Runtime.Loader/src/ApiCompatBaseline.uapaot.txt
+++ b/src/System.Runtime.Loader/src/ApiCompatBaseline.uapaot.txt
@@ -2,6 +2,7 @@ Compat issues with assembly System.Runtime.Loader:
 TypesMustExist : Type 'System.Reflection.Metadata.AssemblyExtensions' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext..ctor(System.Boolean)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_Resolving(System.Func<System.Runtime.Loader.AssemblyLoadContext, System.Reflection.AssemblyName, System.Reflection.Assembly>)' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_ResolvingUnmanagedDll(System.Func<System.Reflection.Assembly, System.String, System.IntPtr>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_Unloading(System.Action<System.Runtime.Loader.AssemblyLoadContext>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.Default.get()' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.GetAssemblyName(System.String)' does not exist in the implementation but it does exist in the contract.
@@ -16,9 +17,10 @@ MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.LoadFromStr
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.LoadUnmanagedDll(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.LoadUnmanagedDllFromPath(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_Resolving(System.Func<System.Runtime.Loader.AssemblyLoadContext, System.Reflection.AssemblyName, System.Reflection.Assembly>)' does not exist in the implementation but it does exist in the contract.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_ResolvingUnmanagedDll(System.Func<System.Reflection.Assembly, System.String, System.IntPtr>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_Unloading(System.Action<System.Runtime.Loader.AssemblyLoadContext>)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.SetProfileOptimizationRoot(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.StartProfileOptimization(System.String)' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.Unload()' does not exist in the implementation but it does exist in the contract.
 TypesMustExist : Type 'System.Runtime.Loader.AssemblyDependencyResolver' does not exist in the implementation but it does exist in the contract.
-Total Issues: 22
+Total Issues: 24