diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66b1f5c..0eab958 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,10 @@
 > - 🏠 Internal
 > - 💅 Polish
 
+## Unreleased
+
+* 🐛 Make sure streams created with a different version of the polyfill do not pass the brand checks. ([#75](https://github.com/MattiasBuelens/web-streams-polyfill/issues/75), [#77](https://github.com/MattiasBuelens/web-streams-polyfill/pull/77))
+
 ## v3.0.3 (2020-04-09)
 
 * 💅 Change `Promise<void>` to `Promise<undefined>` in TypeScript type definitions ([#72](https://github.com/MattiasBuelens/web-streams-polyfill/pull/72))