diff --git a/readme.md b/readme.md
index accd09cb..2821802e 100644
--- a/readme.md
+++ b/readme.md
@@ -11,7 +11,7 @@ mimalloc (pronounced "me-malloc")
 is a general purpose allocator with excellent [performance](#performance) characteristics.
 Initially developed by Daan Leijen for the run-time systems of the
 [Koka](https://github.com/koka-lang/koka) and [Lean](https://github.com/leanprover/lean) languages.
-Latest release:`v1.6.5` (2020-09-24).
+Latest release:`v1.6.6` (2020-09-24).
 
 It is a drop-in replacement for `malloc` and can be used in other programs
 without code changes, for example, on dynamically linked ELF-based systems (Linux, BSD, etc.) you can use it as: