diff --git a/package.json b/package.json
index c365064..7874fd2 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,9 @@
         "node": ">=0.1.90"
     },
     "main": "lib",
+    "dependencies": {
+        "has-flag": "^3.0.0"
+    },
     "files": [
         "examples",
         "lib",