diff --git a/package.json b/package.json
index 68c7dda..dca9be4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "d3-geo-polygon",
-  "version": "1.12.1",
+  "version": "2.0.0-alpha.1",
   "description": "Clipping and geometric operations for spherical polygons.",
   "homepage": "https://github.com/d3/d3-geo-polygon",
   "repository": {