diff --git a/deployment/VL.IO.NDI.nuspec b/deployment/VL.IO.NDI.nuspec
index 75d48ec..a22fc77 100644
--- a/deployment/VL.IO.NDI.nuspec
+++ b/deployment/VL.IO.NDI.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/10/nuspec.xsd">
   <metadata>
     <id>VL.IO.NDI</id>
-    <version>0.5.1-preview</version>
+    <version>0.5.2-preview</version>
     <title>VL.IO.NDI</title>
     <authors>vvvv, Matthias Husinsky, sebl, NewTek</authors>
     <owners>vvvv, Matthias Husinsky, sebl, NewTek</owners>
diff --git a/src/Synchronizer.cs b/src/Synchronizer.cs
index 0e94f7f..07ae382 100644
--- a/src/Synchronizer.cs
+++ b/src/Synchronizer.cs
@@ -61,7 +61,7 @@ IResourceProvider<AudioFrame> IAudioSource.GrabAudioFrame(int sampleCount, Optio
         {
             var syncInstanceHandle = _syncInstanceProvider?.GetHandle();
             if (syncInstanceHandle is null)
-                return ResourceProvider.Return(AudioFrame.Empty);
+                return null;
 
             var nativeAudioFrame = new NDIlib.audio_frame_v2_t();
             NDIlib.framesync_capture_audio(syncInstanceHandle.Resource, ref nativeAudioFrame, sampleRate.Value, channelCount.Value, sampleCount);
@@ -70,7 +70,7 @@ IResourceProvider<AudioFrame> IAudioSource.GrabAudioFrame(int sampleCount, Optio
             {
                 NDIlib.framesync_free_audio(syncInstanceHandle.Resource, ref nativeAudioFrame);
                 syncInstanceHandle.Dispose();
-                return ResourceProvider.Return(AudioFrame.Empty);
+                return null;
             }
 
             var (bufferOwner, audioFrame) = Utils.CreateAudioFrame(ref nativeAudioFrame, interleaved.Value);
diff --git a/src/VL.IO.NDI.csproj b/src/VL.IO.NDI.csproj
index a05b9fe..dd8a51c 100644
--- a/src/VL.IO.NDI.csproj
+++ b/src/VL.IO.NDI.csproj
@@ -9,8 +9,8 @@
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
 
     <!-- Startup properties -->
-    <PackageRepositories>$(MsBuildThisFileDirectory)..\..</PackageRepositories>
-    <VLVersion>2022.5.0-0414-g401adde02c</VLVersion>
+    <PackageRepositories>$([System.IO.Path]::GetFullPath('$(MsBuildThisFileDirectory)..\..'))</PackageRepositories>
+    <VVVVVersion>5.2</VVVVVersion>
     
     <Version>0.5.0</Version>
     <Authors>NewTek, Motzi, sebl, vvvv group</Authors>
@@ -22,7 +22,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="VL.Core" Version="2022.5.0-0414-g401adde02c" />
+    <PackageReference Include="VL.Core" Version="2023.5.2" />
   </ItemGroup>
 
 </Project>