diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 30f1031b..aa03d24d 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+#### 4.0.0-beta-56
+* Add NotifyPropertyChanged for the HasErrors property.
+
 #### 4.0.0-beta-55
 * Add TwoWayT bindings for workflows that reuse bindings.
 * Add OneWayToSeqT bindings.
diff --git a/src/Elmish.WPF/Elmish.WPF.fsproj b/src/Elmish.WPF/Elmish.WPF.fsproj
index 371935dc..a9053e38 100644
--- a/src/Elmish.WPF/Elmish.WPF.fsproj
+++ b/src/Elmish.WPF/Elmish.WPF.fsproj
@@ -18,7 +18,7 @@
     <PackageProjectUrl>https://github.com/elmish/Elmish.WPF</PackageProjectUrl>
     <PackageTags>WPF F# fsharp Elmish Elm</PackageTags>
     <PackageIcon>elmish-wpf-logo-128x128.png</PackageIcon>
-    <Version>4.0.0-beta-55</Version>
+    <Version>4.0.0-beta-56</Version>
     <PackageReleaseNotes>https://github.com/elmish/Elmish.WPF/blob/master/RELEASE_NOTES.md</PackageReleaseNotes>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <!--Turn on warnings for unused values (arguments and let bindings) -->