diff --git a/Directory.Build.props b/Directory.Build.props
index 88f901e..a472fa3 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <VersionPrefix>5.20.2</VersionPrefix>
+    <VersionPrefix>5.21.0</VersionPrefix>
     <PackageValidationBaselineVersion>5.19.1</PackageValidationBaselineVersion>
     <LangVersion>12.0</LangVersion>
     <Nullable>enable</Nullable>
diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index 0c231e4..f8d3819 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -1,5 +1,9 @@
 # Release Notes
 
+## 5.21.0
+
+* Add `BuildApp.CommandLineParsed` to allow initialization based on arguments.
+
 ## 5.20.2
 
 * Support `VersionOverride` with `DotNetClassicTool.TryCreateFrom`.