diff --git a/prj.conf b/prj.conf
index 55466fa..974d6d9 100644
--- a/prj.conf
+++ b/prj.conf
@@ -58,7 +58,7 @@ CONFIG_GOLIOTH_RPC_MAX_RESPONSE_LEN=512
 CONFIG_BOOTLOADER_MCUBOOT=y
 
 # Firmware version used in DFU process
-CONFIG_MCUBOOT_IMGTOOL_SIGN_VERSION="1.0.1"
+CONFIG_MCUBOOT_IMGTOOL_SIGN_VERSION="1.0.0"
 
 # IMPORTANT: Change the Thread network credentials to match your Thread network setup
 CONFIG_OPENTHREAD_NORDIC_LIBRARY_MASTER=y