diff --git a/package-lock.json b/package-lock.json
index cd774fd..a09ff4e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@sabaki/immutable-gametree",
-  "version": "1.8.2",
+  "version": "1.9.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index a11c41e..413b1d8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@sabaki/immutable-gametree",
-  "version": "1.8.2",
+  "version": "1.9.0",
   "description": "An immutable game tree data type.",
   "main": "./src/main.js",
   "scripts": {