diff --git a/package-lock.json b/package-lock.json
index 8731545..2578f12 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
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+      "optional": true,
       "requires": {
         "string-width": "^1.0.2 || 2"
       }