diff --git a/mitmproxy/version.py b/mitmproxy/version.py
index 07c7d5dbd..f31ec7116 100644
--- a/mitmproxy/version.py
+++ b/mitmproxy/version.py
@@ -2,7 +2,7 @@ import os
 import subprocess
 import sys
 
-VERSION = "5.2"
+VERSION = "6.0.0.dev"
 PATHOD = "pathod " + VERSION
 MITMPROXY = "mitmproxy " + VERSION