diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97bac7c..d1b8265 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,3 +25,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Merge of NFC functionality branch
 - Bug fix with compiled USB name being too long causing buffer overrun
 - Change upper byte of counter from `0xff` to `0x7f` to fix issues with some websites.
+
+## [2.1.0] - 2019-03-31
+
+WARNING: This update may break previous registrations! This is because we fixed the U2F counter for good (rather than arbitrarily set the upper byte high for backwards-compatibility reasons, which ends up causing other issues).
+
+- Adds hmac-secret extension support. This extension is used for generating 32 or 64 byte symmetric keys using parameters from the platform and secrets on the authenticator. It's used by Windows Hello - - for offline authentication.
+- Fix bug in FIDO auth, where setting the pin requires all previous registrations to use pin. Only UV bit needs to be cleared.
+- Slightly change serial emulation USB descriptor to make it less abused by Linux Modem Manager.
diff --git a/STABLE_VERSION b/STABLE_VERSION
index 227cea2..7ec1d6d 100644
--- a/STABLE_VERSION
+++ b/STABLE_VERSION
@@ -1 +1 @@
-2.0.0
+2.1.0