diff --git a/package.json b/package.json
index 888de75..6431a0b 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "sinon": "^7.2.7",
     "sinon-chai": "^3.3.0",
     "tslint": "5.13.1",
-    "tsutils": "^3.9.0",
+    "tsutils": "^3.9.1",
     "typedoc": "^0.14.2",
     "typescript": "^3.3.3333",
     "watch": "^1.0.2",