diff --git a/dopt.DeltaBarth/dopt.DeltaBarth.csproj b/dopt.DeltaBarth/dopt.DeltaBarth.csproj
index 48a4e36..77bb443 100644
--- a/dopt.DeltaBarth/dopt.DeltaBarth.csproj
+++ b/dopt.DeltaBarth/dopt.DeltaBarth.csproj
@@ -6,7 +6,7 @@
     <Nullable>enable</Nullable>
     <PlatformTarget>x64</PlatformTarget>
     <Platforms>x64</Platforms>
-    <Version>0.3.3</Version>
+    <Version>0.4.0-alpha1</Version>
     <GenerateDocumentationFile>True</GenerateDocumentationFile>
   </PropertyGroup>