diff --git a/README.md b/README.md
index fdb3f8a8..7211e228 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@
 [travis]: https://travis-ci.org/mcu-tools/mcuboot
 [license]: https://github.com/mcu-tools/mcuboot/blob/main/LICENSE
 
-This is MCUboot version 2.0.0
+This is MCUboot version 2.1.0-dev
 
 MCUboot is a secure bootloader for 32-bits microcontrollers. It defines a
 common infrastructure for the bootloader and the system flash layout on
diff --git a/boot/zephyr/VERSION b/boot/zephyr/VERSION
index f646e74b..428a3550 100644
--- a/boot/zephyr/VERSION
+++ b/boot/zephyr/VERSION
@@ -1,5 +1,5 @@
 VERSION_MAJOR = 2
-VERSION_MINOR = 0
+VERSION_MINOR = 1
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION =
+EXTRAVERSION = dev