diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44dd7423..d01e27b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,17 @@ fragment in
 the fragments are assembled into a version section at release. See that README
 for the format and for when a change warrants an entry at all.
 
+## [0.42.1] 2026-10-05
+
+0.42.1 changes documentation only: no function's behaviour changes, and the
+package gains no Hex dependency.
+
+### Changed
+
+- The hexdocs sidebar groups the guides by the kind of page: the guide to describing a document sits under How-to guides, and the README and the CHANGELOG stay ungrouped at the top. The module groups are unchanged.
+- Three guides read on GitHub take titles that say what they help you do: "How to build common flow patterns", "How to mount the editor for one audience" and "How to theme the editor". No file is renamed, so links to them still resolve.
+- `StatifierBlocks.Editor.Inspector`'s module documentation now places the Note section beside the Config tab's two sections and says why it alone appears only with a block selected.
+
 ## [0.42.0] 2026-09-30
 
 0.42.0 changes three things a host of the editor or the Map can see, and
@@ -3817,6 +3828,7 @@ changed from.
   path. `StatifierBlocks.Edit.Targets.droppable_slots/3` answers `[]` for the
   root rather than crashing, so a caller no longer has to guard around it.
 
+[0.42.1]: https://github.com/riddler/statifier_blocks/releases/tag/v0.42.1
 [0.42.0]: https://github.com/riddler/statifier_blocks/releases/tag/v0.42.0
 [0.41.0]: https://github.com/riddler/statifier_blocks/releases/tag/v0.41.0
 [0.40.0]: https://github.com/riddler/statifier_blocks/releases/tag/v0.40.0
diff --git a/lib/statifier_blocks/compiler.ex b/lib/statifier_blocks/compiler.ex
index a8e9da18..290ca59a 100644
--- a/lib/statifier_blocks/compiler.ex
+++ b/lib/statifier_blocks/compiler.ex
@@ -440,7 +440,7 @@ defmodule StatifierBlocks.Compiler do
   # since a Hex release is the only way a host's bytes change, is every
   # release. `compiler_test.exs` asserts it against `mix.exs` so the
   # two cannot drift silently.
-  @compiler_version "0.42.0"
+  @compiler_version "0.42.1"
 
   # A resolved block and its resolved children, in `slots/1` declaration
   # order. Built once by the Resolve stage and threaded through the rest, so
diff --git a/mix.exs b/mix.exs
index 975ee286..fe25dc9b 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule StatifierBlocks.MixProject do
   use Mix.Project
 
-  @version "0.42.0"
+  @version "0.42.1"
   @source_url "https://github.com/riddler/statifier_blocks"
 
   # ADR-0005 decision 1's acceptance property: the package must compile clean