diff --git a/src/TypedSignalR.Client/CodeAnalysis/SpecialSymbols.cs b/src/TypedSignalR.Client/CodeAnalysis/SpecialSymbols.cs
index ac62535..6d60e18 100644
--- a/src/TypedSignalR.Client/CodeAnalysis/SpecialSymbols.cs
+++ b/src/TypedSignalR.Client/CodeAnalysis/SpecialSymbols.cs
@@ -1,3 +1,4 @@
+using System.Collections.Immutable;
 using Microsoft.CodeAnalysis;
 
 namespace TypedSignalR.Client.CodeAnalysis;
@@ -9,9 +10,9 @@ public class SpecialSymbols
     public readonly INamedTypeSymbol CancellationTokenSymbol;
     public readonly INamedTypeSymbol AsyncEnumerableSymbol;
     public readonly INamedTypeSymbol ChannelReaderSymbol;
-    public readonly INamedTypeSymbol HubConnectionObserverSymbol;
-    public readonly IMethodSymbol CreateHubProxyMethodSymbol;
-    public readonly IMethodSymbol RegisterMethodSymbol;
+    public readonly ImmutableArray<INamedTypeSymbol> HubConnectionObserverSymbols;
+    public readonly ImmutableArray<IMethodSymbol> CreateHubProxyMethodSymbols;
+    public readonly ImmutableArray<IMethodSymbol> RegisterMethodSymbols;
 
     public SpecialSymbols(
         INamedTypeSymbol taskSymbol,
@@ -19,17 +20,17 @@ public SpecialSymbols(
         INamedTypeSymbol cancellationTokenSymbol,
         INamedTypeSymbol asyncEnumerableSymbol,
         INamedTypeSymbol channelReaderSymbol,
-        INamedTypeSymbol hubConnectionObserverSymbol,
-        IMethodSymbol createHubProxyMethodSymbol,
-        IMethodSymbol registerMethodSymbol)
+        ImmutableArray<INamedTypeSymbol> hubConnectionObserverSymbols,
+        ImmutableArray<IMethodSymbol> createHubProxyMethodSymbols,
+        ImmutableArray<IMethodSymbol> registerMethodSymbols)
     {
         TaskSymbol = taskSymbol;
         GenericTaskSymbol = genericTaskSymbol;
         CancellationTokenSymbol = cancellationTokenSymbol;
         AsyncEnumerableSymbol = asyncEnumerableSymbol;
         ChannelReaderSymbol = channelReaderSymbol;
-        HubConnectionObserverSymbol = hubConnectionObserverSymbol;
-        CreateHubProxyMethodSymbol = createHubProxyMethodSymbol;
-        RegisterMethodSymbol = registerMethodSymbol;
+        HubConnectionObserverSymbols = hubConnectionObserverSymbols;
+        CreateHubProxyMethodSymbols = createHubProxyMethodSymbols;
+        RegisterMethodSymbols = registerMethodSymbols;
     }
 }
diff --git a/src/TypedSignalR.Client/SourceGenerator.cs b/src/TypedSignalR.Client/SourceGenerator.cs
index 283c23c..9e3f77f 100644
--- a/src/TypedSignalR.Client/SourceGenerator.cs
+++ b/src/TypedSignalR.Client/SourceGenerator.cs
@@ -129,9 +129,12 @@ private static ValidatedSourceSymbol ValidateCreateHubProxyMethodSymbol((SourceS
             return default;
         }
 
-        if (SymbolEqualityComparer.Default.Equals(extensionMethodSymbol, specialSymbols.CreateHubProxyMethodSymbol))
+        foreach (var createHubProxyMethodSymbol in specialSymbols.CreateHubProxyMethodSymbols)
         {
-            return new ValidatedSourceSymbol(methodSymbol, location);
+            if (SymbolEqualityComparer.Default.Equals(extensionMethodSymbol, createHubProxyMethodSymbol))
+            {
+                return new ValidatedSourceSymbol(methodSymbol, location);
+            }
         }
 
         return default;
@@ -159,9 +162,12 @@ private static ValidatedSourceSymbol ValidateRegisterMethodSymbol((SourceSymbol,
             return default;
         }
 
-        if (SymbolEqualityComparer.Default.Equals(extensionMethodSymbol, specialSymbols.RegisterMethodSymbol))
+        foreach (var registerMethodSymbol in specialSymbols.RegisterMethodSymbols)
         {
-            return new ValidatedSourceSymbol(methodSymbol, location);
+            if (SymbolEqualityComparer.Default.Equals(extensionMethodSymbol, registerMethodSymbol))
+            {
+                return new ValidatedSourceSymbol(methodSymbol, location);
+            }
         }
 
         return default;
@@ -233,41 +239,33 @@ private static SpecialSymbols GetSpecialSymbols(Compilation compilation)
         var cancellationTokenSymbol = compilation.GetTypeByMetadataName("System.Threading.CancellationToken");
         var asyncEnumerableSymbol = compilation.GetTypeByMetadataName("System.Collections.Generic.IAsyncEnumerable`1");
         var channelReaderSymbol = compilation.GetTypeByMetadataName("System.Threading.Channels.ChannelReader`1");
-        var hubConnectionObserverSymbol = compilation.GetTypeByMetadataName("TypedSignalR.Client.IHubConnectionObserver");
-        var memberSymbols = compilation.GetTypeByMetadataName("TypedSignalR.Client.HubConnectionExtensions")!.GetMembers();
+        var hubConnectionObserverSymbol = compilation.GetTypesByMetadataName("TypedSignalR.Client.IHubConnectionObserver");
+        var hubConnectionExtensions = compilation.GetTypesByMetadataName("TypedSignalR.Client.HubConnectionExtensions");
 
-        IMethodSymbol? createHubProxyMethodSymbol = null;
-        IMethodSymbol? registerMethodSymbol = null;
+        ImmutableArray<IMethodSymbol> createHubProxyMethodSymbol = ImmutableArray<IMethodSymbol>.Empty;
+        ImmutableArray<IMethodSymbol> registerMethodSymbol = ImmutableArray<IMethodSymbol>.Empty;
 
-        foreach (var memberSymbol in memberSymbols)
+        foreach (var hubConnectionExtension in hubConnectionExtensions)
         {
-            if (memberSymbol is not IMethodSymbol methodSymbol)
+            foreach (var memberSymbol in hubConnectionExtension.GetMembers())
             {
-                continue;
-            }
+                if (memberSymbol is not IMethodSymbol methodSymbol)
+                {
+                    continue;
+                }
 
-            if (methodSymbol.Name is "CreateHubProxy")
-            {
-                if (methodSymbol.MethodKind is MethodKind.Ordinary)
+                if (methodSymbol.MethodKind is not MethodKind.Ordinary)
                 {
-                    createHubProxyMethodSymbol = methodSymbol;
+                    continue;
+                }
 
-                    if (registerMethodSymbol is not null)
-                    {
-                        break;
-                    }
+                if (methodSymbol.Name is "CreateHubProxy")
+                {
+                    createHubProxyMethodSymbol = createHubProxyMethodSymbol.Add(methodSymbol);
                 }
-            }
-            else if (methodSymbol.Name is "Register")
-            {
-                if (methodSymbol.MethodKind is MethodKind.Ordinary)
+                else if (methodSymbol.Name is "Register")
                 {
-                    registerMethodSymbol = methodSymbol;
-
-                    if (createHubProxyMethodSymbol is not null)
-                    {
-                        break;
-                    }
+                    registerMethodSymbol = registerMethodSymbol.Add(methodSymbol);
                 }
             }
         }
@@ -323,9 +321,12 @@ private static IReadOnlyList<TypeMetadata> ExtractReceiverTypesFromRegisterMetho
 
             ITypeSymbol receiverTypeSymbol = methodSymbol.TypeArguments[0];
 
-            if (SymbolEqualityComparer.Default.Equals(receiverTypeSymbol, specialSymbols.HubConnectionObserverSymbol))
+            foreach (var hubConnectionObserverSymbol in specialSymbols.HubConnectionObserverSymbols)
             {
-                continue;
+                if (SymbolEqualityComparer.Default.Equals(receiverTypeSymbol, hubConnectionObserverSymbol))
+                {
+                    continue;
+                }
             }
 
             var isValid = TypeValidator.ValidateReceiverTypeRule(context, receiverTypeSymbol, specialSymbols, location);
diff --git a/src/TypedSignalR.Client/TypedSignalR.Client.csproj b/src/TypedSignalR.Client/TypedSignalR.Client.csproj
index 00952d4..1faa581 100644
--- a/src/TypedSignalR.Client/TypedSignalR.Client.csproj
+++ b/src/TypedSignalR.Client/TypedSignalR.Client.csproj
@@ -31,7 +31,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.1.0" PrivateAssets="all" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" PrivateAssets="all" />
     </ItemGroup>
 
     <ItemGroup>