diff --git a/package-lock.json b/package-lock.json
index dda56c4..aa323c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -76,9 +76,9 @@
       }
     },
     "acorn": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.0.tgz",
-      "integrity": "sha512-MW/FjM+IvU9CgBzjO3UIPCE2pyEwUsoFl+VGdczOPEdxfGFjuKny/gN54mOuX7Qxmb9Rg9MCn2oKiSUeW+pjrw=="
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.2.tgz",
+      "integrity": "sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ=="
     },
     "agent-base": {
       "version": "4.2.1",