diff --git a/pyproject.toml b/pyproject.toml
index 7edd4e2e9..2486774f1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "joinmarket"
-version = "0.9.11"
+version = "0.9.12dev"
 description = "Joinmarket client library for Bitcoin coinjoins"
 readme = "README.md"
 requires-python = ">=3.8,<3.12"
diff --git a/src/jmbase/support.py b/src/jmbase/support.py
index 065cfda4d..777501fdf 100644
--- a/src/jmbase/support.py
+++ b/src/jmbase/support.py
@@ -12,7 +12,7 @@
 import urllib.parse as urlparse
 
 # JoinMarket version
-JM_CORE_VERSION = '0.9.11'
+JM_CORE_VERSION = '0.9.12dev'
 
 # global Joinmarket constants
 JM_WALLET_NAME_PREFIX = "joinmarket-wallet-"