diff --git a/topojson/__init__.py b/topojson/__init__.py
index 2b3d198..cc9bd0b 100644
--- a/topojson/__init__.py
+++ b/topojson/__init__.py
@@ -20,6 +20,7 @@
   - Optional support for UI controls to exploring the results of topoquantize
     and toposimplify interactively if ipywidgets is installed.
 """
-__version__ = "1.7"
+
+__version__ = "1.9"
 
 from .core.topology import Topology  # noqa