diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10a314e..a69fd5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to the Koopa will be documented in this file.
 
+## Unreleased
+
+### Changed
+
+* Used `phf::Map` instead of `HashMap` in lexer to reduce usage of TLS.
+* Replaced all `Cell`ed-integers with atomic integers.
+
 ## 0.0.8 - 2024-11-30
 
 ### Changed