diff --git a/package.json b/package.json
index 18b44d5..1ed6c95 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "d3-contour",
-  "version": "3.0.2",
+  "version": "3.1.0",
   "description": "Compute contour polygons using marching squares.",
   "homepage": "https://d3js.org/d3-contour/",
   "repository": {