diff --git a/lib/version.py b/lib/version.py
index eb68f918..3c566b04 100644
--- a/lib/version.py
+++ b/lib/version.py
@@ -1,4 +1,4 @@
-ELECTRUM_VERSION = '3.1.3'   # version of the client package
+ELECTRUM_VERSION = '3.1.3b1'   # version of the client package
 PROTOCOL_VERSION = '1.2'     # protocol version requested
 
 # The hash of the mnemonic seed must begin with this