diff --git a/package.json b/package.json
index 6b1ac98..14e8c15 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "eslint-plugin-mocha": "4.9.0",
     "mocha": "6.0.0",
     "npm-version-up": "0.1.5",
-    "graphlib": "2.1.1",
+    "graphlib": "2.1.8",
     "minimatch": "3.0.4",
     "parse-gitignore": "0.4.0",
     "chai-as-promised": "6.0.0",