diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,13 +1,17 @@
 # Browsertime changelog (we do [semantic versioning](https://semver.org))
 
-## 20.0.0 - UNRELEASED
+## 20.0.0 - 2023-12-22
 
 ### Breaking
 * Changed `--userTimingWhitelist` to `--userTimingAllowList` in [#2023](https://github.com/sitespeedio/browsertime/pull/2023).
-* Reading pageCompleetCheck JavaScript now works as intended. It should be a plan JavaScript file named .js [#2034](https://github.com/sitespeedio/browsertime/pull/2034) see [#912](https://github.com/sitespeedio/browsertime/issues/912)
+* Reading pageCompleteCheck JavaScript from file now works as intended. It should be a plain JavaScript file named .js [#2034](https://github.com/sitespeedio/browsertime/pull/2034) see [#912](https://github.com/sitespeedio/browsertime/issues/912)
 
 ### Fixed
 * Group page load parameters as PageLoad to make them easier to find using `--help` [#2035](https://github.com/sitespeedio/browsertime/pull/2035).
+* Fix starting Firefox 121 on Mac [#2043](https://github.com/sitespeedio/browsertime/pull/2043).
+
+### Added
+* Firefox 121 in the Docker container.g
 
 ## 19.3.1 - 2023-12-18
 ### Fixed