diff --git a/example/package-lock.json b/example/package-lock.json
index 65f06e2..3039354 100644
--- a/example/package-lock.json
+++ b/example/package-lock.json
@@ -173,9 +173,9 @@
       "optional": true
     },
     "acorn": {
-      "version": "5.7.3",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw=="
+      "version": "5.7.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg=="
     },
     "acorn-dynamic-import": {
       "version": "3.0.0",
@@ -3396,11 +3396,6 @@
           "resolved": "https://registry.npmjs.org/@types/node/-/node-10.12.18.tgz",
           "integrity": "sha512-fh+pAqt4xRzPfqA6eh3Z2y6fyZavRIumvjhaCL753+TVkGKGhpPeyrJG2JftD0T9q4GF00KjefsQ+PQNDdWQaQ=="
         },
-        "acorn": {
-          "version": "6.0.5",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.5.tgz",
-          "integrity": "sha512-i33Zgp3XWtmZBMNvCr4azvOFeWVw1Rk6p3hfi3LUDvIFraOMywb1kAtrbi+med14m4Xfpqm3zRZMT+c0FNE7kg=="
-        },
         "acorn-jsx": {
           "version": "5.0.1",
           "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
@@ -3957,7 +3952,6 @@
           "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.0.tgz",
           "integrity": "sha512-1MpUfwsdS9MMoN7ZXqAr9e9UKdVHDcvrJpyx7mm1WuQlx/ygErEQBzgi5Nh5qBHIoYweprhtMkTCb9GhcAIcsA==",
           "requires": {
-            "acorn": "^6.0.2",
             "acorn-jsx": "^5.0.0",
             "eslint-visitor-keys": "^1.0.0"
           }
@@ -5084,8 +5078,7 @@
           "integrity": "sha512-NK03gkkOz0CchHBMGomcNqa6U3jLNzHuWK9SI0+1FV475JA6cQxVtjlDcQoKKDNIQ3IwYumIlgoKYDEWUyFBwQ==",
           "requires": {
             "@types/estree": "0.0.39",
-            "@types/node": "*",
-            "acorn": "^6.0.5"
+            "@types/node": "*"
           }
         },
         "rollup-plugin-babel": {