CHANGELOG.adoc in asciidoctor-reducer-1.0.0.alpha.8 vs CHANGELOG.adoc in asciidoctor-reducer-1.0.0.alpha.9

@@ -2,9 +2,35 @@
 :url-repo: https://github.com/asciidoctor/asciidoctor-reducer
 
 This document provides a high-level view of the changes to the Asciidoctor Reducer by release.
 For a detailed view of what has changed, refer to the {url-repo}/commits/main[commit history] on GitHub.
 
+== 1.0.0.alpha.9 (2022-04-21) - @mojavelinux
+
+=== Added
+
+* Add `Asciidoctor::Reducer::IncludeMapper` auxiliary extension, required by `asciidoctor/reducer/include_mapper/extension` (#26)
+* Register `Asciidoctor::Reducer::IncludeMapper` extension when `asciidoctor/reducer/include_mapper` is required (#26)
+* Add `Asciidoctor::Reducer::Extensions.key` method that returns key for registering extension group
+* Update help text to note that the `-a` and `-r` CLI options may be specified multiple times
+* Automate the release process
+
+=== Changed
+
+* Rename x_include_replacements attr on reader to include_replacements since it's public
+* Don't pass `:to` option to `Asciidoctor.load_file`
+* Make `Asciidoctor::Reducer::Cli` a module instead of a class
+
+=== Fixed
+
+* Replace remote include with link if `allow-uri-read` attribute is not set
+* Don't raise error if `Asciidoctor::Reducer::Extensions.unregister` is called when extensions are not registered globally
+* Ensure output is written to file with universal newlines (\n) on Windows
+
+=== Details
+
+{url-repo}/releases/tag/v1.0.0.alpha.9[git tag] | {url-repo}/compare/v1.0.0.alpha.8\...v1.0.0.alpha.9[full diff]
+
 == 1.0.0.alpha.8 (2022-02-23) - @mojavelinux
 
 === Added
 
 * Add secure mode as value of `-S` CLI option (#31)