diff --git a/src/Mediator/Handlers/IRequestHandler.cs b/src/Mediator/Handlers/IRequestHandler.cs
index 35d0f78..415b55b 100644
--- a/src/Mediator/Handlers/IRequestHandler.cs
+++ b/src/Mediator/Handlers/IRequestHandler.cs
@@ -38,7 +38,7 @@ public interface IRequestHandler<in TRequest> : IRequestHandler<TRequest, Unit>
 /// </summary>
 /// <typeparam name="TRequest">The type of request being handled</typeparam>
 public abstract class AsyncRequestHandler<TRequest> : IRequestHandler<TRequest>
-    where TRequest : IRequest
+    where TRequest : IRequest<Unit>
 {
     async ValueTask<Unit> IRequestHandler<TRequest, Unit>.Handle(IServiceProvider provider, TRequest request, CancellationToken cancellationToken)
     {
@@ -82,7 +82,7 @@ ValueTask<TResponse> IRequestHandler<TRequest, TResponse>.Handle(IServiceProvide
 /// </summary>
 /// <typeparam name="TRequest">The type of request being handled</typeparam>
 public abstract class RequestHandler<TRequest> : IRequestHandler<TRequest>
-    where TRequest : IRequest
+    where TRequest : IRequest<Unit>
 {
     ValueTask<Unit> IRequestHandler<TRequest, Unit>.Handle(IServiceProvider provider, TRequest request,
         CancellationToken cancellationToken)
diff --git a/src/Mediator/Mediator.csproj b/src/Mediator/Mediator.csproj
index ef986c1..fe0e027 100644
--- a/src/Mediator/Mediator.csproj
+++ b/src/Mediator/Mediator.csproj
@@ -13,7 +13,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="MediatR.Contracts" Version="1.0.1" />
+        <PackageReference Include="MediatR.Contracts" Version="2.0.1" />
         <PackageReference Include="IsExternalInit" Version="1.0.2" PrivateAssets="all" />
     </ItemGroup>