diff --git a/setup.cfg b/setup.cfg
index 9b62bd6..b1de03e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = sgraph
-version = 1.8.0
+version = 1.9.0
 description = sgraph hierarchic graph data structure, format and algorithms
 long_description = file: README.md
 long_description_content_type = text/markdown