diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70d5301..1786511 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,10 @@
 * feature: improve panic message when `clean_content_tags` conflicts with other options
 * feature: add support for sanitizing the `style` attribute
 
+# 4.0.1
+
+* fix: unexpected namespace switches after cleanup can cause mXSS (backport 4.1.2)
+
 # 4.0.0
 
 * Update html5ever to 0.27
@@ -25,6 +29,10 @@
 * Security fixes are not backported to the 2.0 branch any more.
   Only the v3 and v4 branches are supported.
 
+# 3.3.1
+
+* fix: unexpected namespace switches after cleanup can cause mXSS (backport 4.1.2)
+
 # 3.3.0
 
 * chore: bump MSRV to 1.60.0