diff --git a/ampel-firmware/util.h b/ampel-firmware/util.h
index 79fcb7d41da041c2c0d64e7f194f0488fc09393c..5d13bae02394ca2db91a319e0d8d7aaf3eac0612 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 = "v0.2.2"; // Update manually after significant changes.
+  const char *version = "v0.2.3-DEV"; // Update manually after significant changes.
   const char *board;
   const char *sensorId;
   const char *macAddress;