diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# v6.6.0
+- Online benchmark protocol upgraded to v2, validation not compatible with previous versions.
+  - Single thread benchmark now is cheat-resistant, not possible speedup it with multiple threads.
+  - RandomX dataset is now always initialized with static seed, to prevent time cheat by report slow dataset initialization.
+  - Zero delay online submission, to make time validation much more precise and strict.
+  - DNS cache for online benchmark to prevent unexpected delays.
+
 # v6.5.3
 - [#1946](https://github.com/xmrig/xmrig/pull/1946) Fixed MSR mod names in JSON API (v6.5.2 affected).