diff --git a/electrum/version.py b/electrum/version.py
index 7a38b72ca..d005ae05d 100644
--- a/electrum/version.py
+++ b/electrum/version.py
@@ -1,5 +1,5 @@
-ELECTRUM_VERSION = '4.2.1'     # version of the client package
-APK_VERSION = '4.2.1.0'        # read by buildozer.spec
+ELECTRUM_VERSION = '4.3.0a0'     # version of the client package
+APK_VERSION = '4.3.0.0'          # read by buildozer.spec
 
 PROTOCOL_VERSION = '1.4'     # protocol version requested