diff --git a/CHANGELOG.md b/CHANGELOG.md
index e14032684c5d23089c6157e9763e9134c0b13a49..e07d2aa3506f879c22c589681302195a0ba7273c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change Log
 
+## [v0.2.2](https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-firmware/-/releases/v0.2.2) 2021/10/01
+
+* MAC address is now shown at startup and via HTTP
+
 ## [v0.2.1](https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-firmware/-/releases/v0.2.1) 2021/06/06
 
 * BUGFIX: Sensor would keep on calibrating after successful calibration.
diff --git a/ampel-firmware/util.h b/ampel-firmware/util.h
index 5d13bae02394ca2db91a319e0d8d7aaf3eac0612..79fcb7d41da041c2c0d64e7f194f0488fc09393c 100644
--- a/ampel-firmware/util.h
+++ b/ampel-firmware/util.h
@@ -38,7 +38,7 @@ class Ampel {
 private:
   static void showFreeSpace();
 public:
-  const char *version = "v0.2.3-DEV"; // Update manually after significant changes.
+  const char *version = "v0.2.2"; // Update manually after significant changes.
   const char *board;
   const char *sensorId;
   const char *macAddress;