diff --git a/microservices/blockchainConnector/package-lock.json b/microservices/blockchainConnector/package-lock.json
index 59669b0..f47c6aa 100644
--- a/microservices/blockchainConnector/package-lock.json
+++ b/microservices/blockchainConnector/package-lock.json
@@ -71,9 +71,9 @@
       }
     },
     "@openzeppelin/contracts": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.5.0.tgz",
-      "integrity": "sha512-t3jm8FrhL9tkkJTofkznTqo/XXdHi21w5yXwalEnaMOp22ZwZ0f/mmKdlgMMLPFa6bSVHbY88mKESwJT/7m5Lg=="
+      "version": "4.4.2",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.4.2.tgz",
+      "integrity": "sha512-NyJV7sJgoGYqbtNUWgzzOGW4T6rR19FmX1IJgXGdapGPWsuMelGJn9h03nos0iqfforCbCB0iYIR0MtIuIFLLw=="
     },
     "abbrev": {
       "version": "1.1.1",
diff --git a/microservices/blockchainConnector/package.json b/microservices/blockchainConnector/package.json
old mode 100755
new mode 100644
index 6cfe8eb..01a50c6
--- a/microservices/blockchainConnector/package.json
+++ b/microservices/blockchainConnector/package.json
@@ -14,7 +14,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@openzeppelin/contracts": "^2.5.0",
+    "@openzeppelin/contracts": "^4.4.2",
     "async": "^2.6.2",
     "bcrypt": "^3.0.2",
     "bignumber.js": "5.0.0",