diff --git a/package.json b/package.json
index c859fdf..60ab20e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "graph-data-structure",
-  "version": "1.8.0",
+  "version": "1.9.0",
   "description": "A graph data structure with topological sort.",
   "main": "index.js",
   "files": [