diff --git a/Directory.Build.props b/Directory.Build.props
index 979dfb3e..b51f51cf 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -9,7 +9,7 @@
     <NuGetAudit>false</NuGetAudit>
     <!-- The SDK version (docs/guide/sdk.md): Alpha, 0.x; incompatible API changes may happen between Alpha versions.
          Engine assemblies carry it and every demo package records it. Games set their own <Version>. -->
-    <MicroEngineVersion>0.5.0-alpha.2</MicroEngineVersion>
+    <MicroEngineVersion>0.6.0-alpha.1</MicroEngineVersion>
     <Version>$(MicroEngineVersion)</Version>
   </PropertyGroup>
   <!-- Browser packages are published (web/build.sh passes MicroEngineWebPackage=true): the engine and games they
diff --git a/docs/api/README.md b/docs/api/README.md
index 038ee115..6e16a796 100644
--- a/docs/api/README.md
+++ b/docs/api/README.md
@@ -1,6 +1,6 @@
 # API reference
 
-The public types of the MicroEngine SDK 0.5.0-alpha.2, one page per namespace and per type: signatures, parameters, default
+The public types of the MicroEngine SDK 0.6.0-alpha.1, one page per namespace and per type: signatures, parameters, default
 values and the descriptions written in the engine's source. It covers the four engine packages (`MicroEngine`,
 `MicroEngine.Sdl`, `MicroEngine.Raylib`, `MicroEngine.Desktop`); the `microengine` tool is documented in
 [The microengine tool](../guide/cli.md).
diff --git a/docs/examples/hello-engine.md b/docs/examples/hello-engine.md
index e74e5f97..77e4d2bf 100644
--- a/docs/examples/hello-engine.md
+++ b/docs/examples/hello-engine.md
@@ -24,7 +24,7 @@ folder builds anywhere:
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 </Project>
 ```
diff --git a/docs/guide/first-game.md b/docs/guide/first-game.md
index a092545d..49a8e960 100644
--- a/docs/guide/first-game.md
+++ b/docs/guide/first-game.md
@@ -72,7 +72,7 @@ template's files, with `MyGame` where your project's name goes.
 </Project>
 ```
 
-In your project `MICROENGINE_VERSION` is the tool's version (`0.5.0-alpha.2`). The second group is the game's
+In your project `MICROENGINE_VERSION` is the tool's version (`0.6.0-alpha.1`). The second group is the game's
 identity: every package `microengine package` builds takes its name, id, version, icon and orientation from there, and
 nowhere else. The browser, Android and iOS hosts call the game's `Configure` entry point (below), the same one
 `Program.cs` uses, so there is nothing to keep in step.
diff --git a/docs/guide/getting-microengine.md b/docs/guide/getting-microengine.md
index ab7c4f6d..24942730 100644
--- a/docs/guide/getting-microengine.md
+++ b/docs/guide/getting-microengine.md
@@ -5,7 +5,7 @@ packages on [nuget.org](https://www.nuget.org/packages/MicroEngine): the engine,
 `microengine` command-line tool and a project template. This page installs them and checks that everything works; the next page,
 [Your first game](first-game.md), creates and runs a game.
 
-The current version is **0.5.0-alpha.2**, an Alpha pre-release ([Versions and compatibility](sdk.md)). Because it is a
+The current version is **0.6.0-alpha.1**, an Alpha pre-release ([Versions and compatibility](sdk.md)). Because it is a
 pre-release, NuGet commands need `--prerelease` or the exact version.
 
 Only want to play the demos? They are on the [demo pages](/demos/), in the browser and as downloads
@@ -32,12 +32,12 @@ dotnet tool install -g MicroEngine.Cli --prerelease
 microengine version
 ```
 
-`microengine version` prints `0.5.0-alpha.2`. The tool creates, runs, builds and packages games
+`microengine version` prints `0.6.0-alpha.1`. The tool creates, runs, builds and packages games
 ([The microengine tool](cli.md)).
 
 If the shell says `microengine` is not found, the folder of .NET global tools is not on your `PATH`: add
 `%USERPROFILE%\.dotnet\tools` (Windows) or `~/.dotnet/tools` (Linux, macOS) to it and open a new terminal. To install
-an exact version instead of the newest pre-release: `dotnet tool install -g MicroEngine.Cli --version 0.5.0-alpha.2`.
+an exact version instead of the newest pre-release: `dotnet tool install -g MicroEngine.Cli --version 0.6.0-alpha.1`.
 
 ## 3. The project template
 
@@ -45,7 +45,7 @@ an exact version instead of the newest pre-release: `dotnet tool install -g Micr
 there is nothing to do. To install it yourself, for example to use `dotnet new` or an IDE's "New project" dialog:
 
 ```bash
-dotnet new install MicroEngine.Templates::0.5.0-alpha.2
+dotnet new install MicroEngine.Templates::0.6.0-alpha.1
 dotnet new microengine-game -n StarCourier --app-id com.yourstudio.starcourier --title "Star Courier"
 ```
 
diff --git a/docs/guide/project-structure.md b/docs/guide/project-structure.md
index 68ae0b4a..7e61e117 100644
--- a/docs/guide/project-structure.md
+++ b/docs/guide/project-structure.md
@@ -69,7 +69,7 @@ samples/HelloEngine/
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 </Project>
 ```
diff --git a/docs/guide/release-notes.md b/docs/guide/release-notes.md
index 50b9dd43..9ab2fa32 100644
--- a/docs/guide/release-notes.md
+++ b/docs/guide/release-notes.md
@@ -4,9 +4,11 @@ One section per SDK version, newest first. The SDK is in Alpha: a version may ch
 every such change is in the [migration notes](../migrations.md). Releases are tagged `sdk-v<version>`; the demo
 releases (`v0.1.0`, `v0.2.0`...) are separate.
 
-## Next release
+## 0.6.0-alpha.1
 
-An eighth package: `MicroEngine.Physics.Box2D`, optional, for dynamic bodies.
+An eighth package: `MicroEngine.Physics.Box2D`, optional, for dynamic bodies. Diagnostics for finding out why a game
+misbehaves, and packaging with a .NET SDK newer than 10. The UI components and the project property deprecated earlier
+are removed: read the [migration notes](../migrations.md#060-alpha1) before updating.
 
 **New**
 
@@ -45,7 +47,7 @@ An eighth package: `MicroEngine.Physics.Box2D`, optional, for dynamic bodies.
 
 - `DialogueBox`, `Typewriter`, `SelectionList`, `Toasts`, `Toast`, `AchievementToasts`, `AchievementsScene`,
   `Game.UseAchievements` and `Game.AchievementToasts`, deprecated in 0.5.0-alpha.2. Build them from widgets and call
-  `TrackAchievements` ([migration notes](../migrations.md#next-release)).
+  `TrackAchievements` ([migration notes](../migrations.md#060-alpha1)).
 - The `MicroEngineGameFactory` project property, deprecated in 0.5.0-alpha.1. `microengine package` builds browser,
   Android and iOS packages from the game's `Configure(HostBuilder)` entry point only, and stops with the method to add
   when a game has none. The tutorial's Gem Garden declares the entry point from its first step.
diff --git a/docs/guide/sdk.md b/docs/guide/sdk.md
index a4446540..2473a01f 100644
--- a/docs/guide/sdk.md
+++ b/docs/guide/sdk.md
@@ -1,6 +1,6 @@
 # Versions and compatibility
 
-**MicroEngine SDK 0.5.0-alpha.2 — Alpha.** It is on nuget.org: [`MicroEngine.Cli`](https://www.nuget.org/packages/MicroEngine.Cli)
+**MicroEngine SDK 0.6.0-alpha.1 — Alpha.** It is on nuget.org: [`MicroEngine.Cli`](https://www.nuget.org/packages/MicroEngine.Cli)
 and the five other packages below ([release notes](release-notes.md)). [Getting MicroEngine](getting-microengine.md)
 shows how to install it.
 
@@ -49,6 +49,6 @@ One part of the engine stays out of every published package: the 3D path
 
 ## Published version and development
 
-The documentation describes the published SDK, **0.5.0-alpha.2**, and every code sample on this site is built against
+The documentation describes the published SDK, **0.6.0-alpha.1**, and every code sample on this site is built against
 the packages on nuget.org. The documentation and the SDK are published together, so a page never describes an engine
 the packages do not have.
diff --git a/docs/guide/status.md b/docs/guide/status.md
index 22f955f6..5bde0418 100644
--- a/docs/guide/status.md
+++ b/docs/guide/status.md
@@ -1,6 +1,6 @@
 # What MicroEngine offers today
 
-**MicroEngine SDK 0.5.0-alpha.2.** A working 2D engine for .NET 10, open source under the MIT License, installed from
+**MicroEngine SDK 0.6.0-alpha.1.** A working 2D engine for .NET 10, open source under the MIT License, installed from
 nuget.org ([Getting MicroEngine](getting-microengine.md)). Games built with it run on Windows, Linux, macOS, Android,
 iOS and in web browsers. It is in Alpha: public APIs may still change between 0.x versions ([Versions](sdk.md)).
 
diff --git a/docs/guide/updating.md b/docs/guide/updating.md
index 323930a4..b30cbdbd 100644
--- a/docs/guide/updating.md
+++ b/docs/guide/updating.md
@@ -17,10 +17,10 @@ The [release notes](release-notes.md) say what each version adds, changes and fi
 
 ```bash
 dotnet tool update -g MicroEngine.Cli --prerelease
-dotnet new install MicroEngine.Templates::0.5.0-alpha.2
+dotnet new install MicroEngine.Templates::0.6.0-alpha.1
 ```
 
-Replace `0.5.0-alpha.2` with the version you are moving to. The template only matters for new projects:
+Replace `0.6.0-alpha.1` with the version you are moving to. The template only matters for new projects:
 `microengine new` installs the template of the tool's version when it is missing.
 
 ## 3. Update the game's packages
@@ -28,13 +28,13 @@ Replace `0.5.0-alpha.2` with the version you are moving to. The template only ma
 In the game's project file, set every `MicroEngine.*` package to the same version as the tool:
 
 ```xml
-<PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+<PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
 ```
 
 or let `dotnet` edit the file:
 
 ```bash
-dotnet add package MicroEngine.Desktop --version 0.5.0-alpha.2
+dotnet add package MicroEngine.Desktop --version 0.6.0-alpha.1
 ```
 
 ## 4. Read the migration notes, build and test
@@ -57,7 +57,7 @@ for that game only, as a local tool:
 
 ```bash
 dotnet new tool-manifest
-dotnet tool install MicroEngine.Cli --version 0.5.0-alpha.2
+dotnet tool install MicroEngine.Cli --version 0.6.0-alpha.1
 dotnet tool run microengine version
 ```
 
diff --git a/docs/manual/text.md b/docs/manual/text.md
index 711a959d..29da8aa3 100644
--- a/docs/manual/text.md
+++ b/docs/manual/text.md
@@ -124,7 +124,7 @@ TTF/OTF font whose text is shaped by HarfBuzz, the shaping engine browsers and o
 next to the engine:
 
 ```xml
-<PackageReference Include="MicroEngine.Text.Shaping" Version="0.5.0-alpha.2" />
+<PackageReference Include="MicroEngine.Text.Shaping" Version="0.6.0-alpha.1" />
 ```
 
 It is a package of its own because HarfBuzz is a native library: games that only write Latin text do not carry it.
diff --git a/docs/manual/world.md b/docs/manual/world.md
index 1e1189f4..fd7fb6ca 100644
--- a/docs/manual/world.md
+++ b/docs/manual/world.md
@@ -253,7 +253,7 @@ games that need what the tile backend refuses: dynamic bodies, rotation, circles
 collision, friction and mass. It is an optional package; the tile backend needs none:
 
 ```xml
-<PackageReference Include="MicroEngine.Physics.Box2D" Version="0.5.0-alpha.2" />
+<PackageReference Include="MicroEngine.Physics.Box2D" Version="0.6.0-alpha.1" />
 ```
 
 Choose the backend where the world is made; code that uses only the core then runs on either. Keep the tile backend
diff --git a/docs/migrations.md b/docs/migrations.md
index 05886221..ab843d54 100644
--- a/docs/migrations.md
+++ b/docs/migrations.md
@@ -4,7 +4,7 @@ What changes between SDK versions and how to update a game. MicroEngine is in Al
 a version may change public APIs incompatibly, and when it does, the change is listed here with the version that makes
 it. Newest first.
 
-## Next release
+## 0.6.0-alpha.1
 
 ### Removed UI components
 
diff --git a/docs/tutorial/01-project.md b/docs/tutorial/01-project.md
index 1f7eaaa5..543bc6dc 100644
--- a/docs/tutorial/01-project.md
+++ b/docs/tutorial/01-project.md
@@ -53,7 +53,7 @@ GemGarden/
   <ItemGroup>
     <!-- The engine with the desktop platforms (SDL 3 by default, raylib). A game that ships SDL only can reference
          MicroEngine.Sdl instead. -->
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/docs/tutorial/12-packaging.md b/docs/tutorial/12-packaging.md
index 1903777d..55a797d4 100644
--- a/docs/tutorial/12-packaging.md
+++ b/docs/tutorial/12-packaging.md
@@ -34,7 +34,7 @@ it by) comes from the second group of the project file. For the release, set the
   <ItemGroup>
     <!-- The engine with the desktop platforms (SDL 3 by default, raylib). A game that ships SDL only can reference
          MicroEngine.Sdl instead. -->
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 
   <ItemGroup>
@@ -69,7 +69,7 @@ Orientation  landscape
 Factory      new GemGarden.MainGame()
 Content      ...\GemGarden\Content\
 Licence      (none)
-Engine       MicroEngine 0.5.0-alpha.2, net10.0
+Engine       MicroEngine 0.6.0-alpha.1, net10.0
 ```
 
 `Licence (none)`: a `LICENSE`, `LICENSE.txt` or `LICENSE.md` file next to the project is shipped in every package as
diff --git a/samples/AssetGallery/AssetGallery.csproj b/samples/AssetGallery/AssetGallery.csproj
index df9ced63..9bc89630 100644
--- a/samples/AssetGallery/AssetGallery.csproj
+++ b/samples/AssetGallery/AssetGallery.csproj
@@ -17,6 +17,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 </Project>
diff --git a/samples/Examples/Examples.csproj b/samples/Examples/Examples.csproj
index a17985a2..82f35fab 100644
--- a/samples/Examples/Examples.csproj
+++ b/samples/Examples/Examples.csproj
@@ -16,9 +16,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
     <!-- Shaped text for the right-to-left example: optional, with HarfBuzz. -->
-    <PackageReference Include="MicroEngine.Text.Shaping" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Text.Shaping" Version="0.6.0-alpha.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/samples/GemGarden/part1-scenes/GemGarden.csproj b/samples/GemGarden/part1-scenes/GemGarden.csproj
index 68ba9051..5c9d0abf 100644
--- a/samples/GemGarden/part1-scenes/GemGarden.csproj
+++ b/samples/GemGarden/part1-scenes/GemGarden.csproj
@@ -21,7 +21,7 @@
   <ItemGroup>
     <!-- The engine with the desktop platforms (SDL 3 by default, raylib). A game that ships SDL only can reference
          MicroEngine.Sdl instead. -->
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/samples/GemGarden/part2-hero/GemGarden.csproj b/samples/GemGarden/part2-hero/GemGarden.csproj
index 68ba9051..5c9d0abf 100644
--- a/samples/GemGarden/part2-hero/GemGarden.csproj
+++ b/samples/GemGarden/part2-hero/GemGarden.csproj
@@ -21,7 +21,7 @@
   <ItemGroup>
     <!-- The engine with the desktop platforms (SDL 3 by default, raylib). A game that ships SDL only can reference
          MicroEngine.Sdl instead. -->
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/samples/GemGarden/part3-garden/GemGarden.csproj b/samples/GemGarden/part3-garden/GemGarden.csproj
index 68ba9051..5c9d0abf 100644
--- a/samples/GemGarden/part3-garden/GemGarden.csproj
+++ b/samples/GemGarden/part3-garden/GemGarden.csproj
@@ -21,7 +21,7 @@
   <ItemGroup>
     <!-- The engine with the desktop platforms (SDL 3 by default, raylib). A game that ships SDL only can reference
          MicroEngine.Sdl instead. -->
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/samples/GemGarden/part4-complete/GemGarden.csproj b/samples/GemGarden/part4-complete/GemGarden.csproj
index e6699f27..192f3e2f 100644
--- a/samples/GemGarden/part4-complete/GemGarden.csproj
+++ b/samples/GemGarden/part4-complete/GemGarden.csproj
@@ -21,7 +21,7 @@
   <ItemGroup>
     <!-- The engine with the desktop platforms (SDL 3 by default, raylib). A game that ships SDL only can reference
          MicroEngine.Sdl instead. -->
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/samples/HelloEngine/HelloEngine.csproj b/samples/HelloEngine/HelloEngine.csproj
index 270de0db..85af2367 100644
--- a/samples/HelloEngine/HelloEngine.csproj
+++ b/samples/HelloEngine/HelloEngine.csproj
@@ -6,6 +6,6 @@
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
   </ItemGroup>
 </Project>
diff --git a/samples/PhysicsSubstitution/PhysicsSubstitution.csproj b/samples/PhysicsSubstitution/PhysicsSubstitution.csproj
index 3e0279e5..33193c9a 100644
--- a/samples/PhysicsSubstitution/PhysicsSubstitution.csproj
+++ b/samples/PhysicsSubstitution/PhysicsSubstitution.csproj
@@ -18,7 +18,7 @@
     <Description>One platformer's gameplay code on two physics backends.</Description>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="MicroEngine.Desktop" Version="0.5.0-alpha.2" />
-    <PackageReference Include="MicroEngine.Physics.Box2D" Version="0.5.0-alpha.2" />
+    <PackageReference Include="MicroEngine.Desktop" Version="0.6.0-alpha.1" />
+    <PackageReference Include="MicroEngine.Physics.Box2D" Version="0.6.0-alpha.1" />
   </ItemGroup>
 </Project>
diff --git a/sdk/version.json b/sdk/version.json
index 37783f10..0b8f248e 100644
--- a/sdk/version.json
+++ b/sdk/version.json
@@ -1,3 +1,3 @@
 {
-  "documented": "0.5.0-alpha.2"
+  "documented": "0.6.0-alpha.1"
 }