diff --git a/pyproject.toml b/pyproject.toml
index d27047320..9037015a4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "flit_core.buildapi"
 
 [project]
 name = "pyaerocom"
-version = "0.17.1"
+version = "0.18.dev0"
 authors = [{ name = "MET Norway" }]
 description = "pyaerocom model evaluation software"
 classifiers = [