diff --git a/pureboot/pureboot.py b/pureboot/pureboot.py
index 4f061b1..0d9d561 100644
--- a/pureboot/pureboot.py
+++ b/pureboot/pureboot.py
@@ -24,7 +24,7 @@ else:
     import termios
 
 PROMPT = b"+"
-VERSION = 4  # this tool's own version — free to drift from a loader's
+VERSION = 5  # this tool's own version — free to drift from a loader's
 # The loader versions this tool speaks. A pureboot version implies its wire
 # protocol, which carries no number of its own, so this window is where that
 # map lives: every version so far speaks the same protocol, and one that