diff --git a/backend/package-lock.json b/backend/package-lock.json
old mode 100755
new mode 100644
index 5176feb..1aa7e19
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -321,9 +321,9 @@
       "dev": true
     },
     "ajv": {
-      "version": "6.12.0",
-      "resolved": "https://registry.npm.taobao.org/ajv/download/ajv-6.12.0.tgz?cache=0&sync_timestamp=1582379551272&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fajv%2Fdownload%2Fajv-6.12.0.tgz",
-      "integrity": "sha1-BtYLlth7hFSlrauobnhU2mKdtLc=",
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "requires": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",