diff --git a/bindings/python/notmuch/version.py b/bindings/python/notmuch/version.py
index dc1f1440..feb517b5 100644
--- a/bindings/python/notmuch/version.py
+++ b/bindings/python/notmuch/version.py
@@ -1,2 +1,2 @@
 # this file should be kept in sync with ../../../version
-__VERSION__ = '0.9'
+__VERSION__ = '0.10~rc1'
diff --git a/version b/version
index b63ba696..bdc34446 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-0.9
+0.10~rc1