diff --git a/python/obitools3/version.py b/python/obitools3/version.py
index 2725823..566bcb7 100755
--- a/python/obitools3/version.py
+++ b/python/obitools3/version.py
@@ -1,5 +1,5 @@
 major = 3
 minor = 0
-serial= '1b19'
+serial= '1b20'
 
 version ="%d.%d.%s" % (major,minor,serial)