diff --git a/package-lock.json b/package-lock.json
index e8fd5ea..234e63a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -288,9 +288,9 @@
       }
     },
     "acorn": {
-      "version": "6.3.0",
-      "resolved": "https://botbuilder.myget.org/F/botbuilder-declarative/npm/acorn/-/acorn-6.3.0.tgz",
-      "integrity": "sha1-AIdQkRn/pPwKAEHR6TpBfmjLhW4=",
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+      "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
       "dev": true
     },
     "agent-base": {