diff --git a/CHANGELOG.md b/CHANGELOG.md
index eef10e3..72d6477 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,7 +14,7 @@ each change under the current top section as you work.
 ## [1.5.5]
 
 ### Changed
-- **Payments now run on the current Stripe library.** The plugin had fallen four major versions behind Stripe's PHP SDK, which also meant it was asking Stripe to behave like an older version of its API. Taking a card payment and handling a webhook work exactly as before — the same charge is raised, the same events are honoured, and a forged webhook is still rejected — but the plugin now speaks Stripe's current API version, so later payment work does not have to clear this upgrade first. Nothing to do on your side.
+- **Payments moved up to version 21 of Stripe's PHP library**, from version 17. Being four major versions behind also meant asking Stripe to behave like an older version of its API; the plugin now uses API version `2026-07-29.dahlia`. Taking a card payment and handling a webhook are unchanged — the same charge is raised, the same events are honoured, and a forged webhook is still rejected. Nothing to do on your side.
 
 ## [1.5.4]