diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6759fdee..4928a5eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 ### Changed
 - Updated projects URL.
+- Updated hub firmware to [v3.1.0a1].
 - Updated docs.
 
 ## [1.0.0] - 2021-06-08
@@ -25,6 +26,7 @@ Prerelease changes are documented at [support#48].
 <!-- let's try to keep this list sorted -->
 [support#48]: https://github.com/pybricks/support/issues/48
 [v3.0.0]: https://github.com/pybricks/pybricks-micropython/blob/master/CHANGELOG.md#300---2021-06-08
+[v3.1.0a1]: https://github.com/pybricks/pybricks-micropython/blob/master/CHANGELOG.md#310a1---2021-06-23
 
 [Unreleased]: https://github.com/pybricks/pybricks-code/compare/v1.0.0...HEAD
 [1.0.0]: https://github.com/pybricks/pybricks-code/compare/v1.0.0-rc.2...v1.0.0