diff --git a/README.md b/README.md
index 981371d..aa25612 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ and optional library packages are the following:
 ### Compile-time dependencies
 
 - The [css4j](https://github.com/css4j/css4j/releases) library (and its transitive
-  dependencies); version 3.8.0 or higher is recommended (compatibility with 4.0 or
+  dependencies); version 3.9.0 or higher is recommended (compatibility with 4.0 or
   higher is not guaranteed).
 
 - The [css4j-agent](https://github.com/css4j/css4j-agent/releases) library;
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 9b9f977..032f02a 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,29 +1,22 @@
-# css4j-dom4j version 3.8 Release Notes
+# css4j-dom4j version 3.9 Release Notes
 
-### August 21, 2022
+### October 19, 2022
 
 <br/>
 
 ## Release Highlights
 
-### Use `<style>` elements from any namespace for computing styles
+### Add `rebuildCascade()` to `XHTMLDocument`
 
-In style computation, inline styles that were in a non-HTML namespace were not
-being used. This is what some browsers did in the past but that is no longer the
-case.
-
-Now it uses style elements having any namespace, which matches the current
-behaviour of web browsers and makes it easier to support inlined SVG.
+Gives a native, more efficient implementation to css4j's `CSSDocument.rebuildCascade()` default method.
 
 ## Detail of changes
 
-- Use `<style>` elements from any namespace for computing styles.
-- Javadoc: add a module description.
-- Fix javadoc warning.
-- Gradle: upgrade wrapper to 7.5.1.
-- Upgrade `extra-java-module-info` plugin to 0.15.
-- Actions: switch from 'adopt' distribution to 'temurin', setup-java@v2 to 3.
-- Actions: upgrade actions/checkout to v3.
+- Check for read-only in `setAttributeNode()`.
+- Prevent NPE in `setTargetMedium(String)`.
+- Upgrade to css4j 3.9.0
+- Upgrade to `extra-java-module-info` 1.0
+- Gradle: prefer version 2.0.3 of `slf4j-api`.
 
 ## Project Sites