diff --git a/cloudfunctions/sum/package-lock.json b/cloudfunctions/sum/package-lock.json
index a27ced1..921d2c1 100644
--- a/cloudfunctions/sum/package-lock.json
+++ b/cloudfunctions/sum/package-lock.json
@@ -6,13 +6,13 @@
   "dependencies": {
     "ajv": {
       "version": "6.6.1",
-      "resolved": "http://registry.npm.taobao.org/ajv/download/ajv-6.6.1.tgz",
-      "integrity": "sha1-Y2D17Q2A8jLMKylMNi1dwuU43WE=",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.6.1.tgz",
+      "integrity": "sha512-ZoJjft5B+EJBjUyu9C9Hc0OZyPZSSlOF+plzouTrg6UlA8f+e/n8NIgBFG/9tppJtpPWfthHakK7juJdNDODww==",
       "requires": {
-        "fast-deep-equal": "2.0.1",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.4.1",
-        "uri-js": "4.2.2"
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
     "asn1": {