diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..f2d8b16
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,10 @@
+### 0.5.10
+
+- 99.9% of fees paid out to maker & gui
+- 2 fee tiers: STABLE (1bps) & BASE (4bps)
+- no more fee discounts for SRM & MSRM holders
+- fill event and open orders balance logging in process_consume_events
+- allow library users to find orders by order id
+- remove unused serum-pool code
+- anchor verifiable builds, tests and linters run on CI
+- define a security policy and setup security txt