diff --git a/docs/progress/upgrades.md b/docs/progress/upgrades.md
index 9a0b969d..99aa12aa 100644
--- a/docs/progress/upgrades.md
+++ b/docs/progress/upgrades.md
@@ -160,9 +160,17 @@ For more information, see [Announcing Etherlink 6.4: a security and liveness har
 ## Etherlink 6.5
 
 The Etherlink 6.5 upgrade went live on 27 June 2026 through the fast kernel governance process and addressed a critical vulnerability that has been reported through the Tezos Foundation’s security bug bounty platform.
+This vulnerability could allow an attacker to claim several times a deposit made via the FA bridge, under certain circumstances.
 
 For more information, see [Announcing Etherlink 6.5: a security bugfix for Farfadet](https://forum.tezosagora.org/t/announcing-etherlink-6-5-a-security-bugfix-for-farfadet/7120).
 
+## Etherlink 6.6
+
+The Etherlink 6.6 upgrade went live on 18 July 2026 through the fast kernel governance process and introduced a series of security and robustness improvements to the Etherlink kernel, further strengthening the network's reliability and resilience.
+In particular, it contains three fixes hardening the sequencer upgrade (or change) and one fix of a liveness/DoS bug in the decoding of blueprints.
+
+For more information, see [Announcing Etherlink 6.6: a security hardening kernel upgrade proposal](https://forum.tezosagora.org/t/announcing-etherlink-6-6-a-security-hardening-kernel-upgrade-proposal/7137).
+
 ## Changelog
 
 For full details about changes to Etherlink, see [Changelogs](/progress/changelogs).