diff --git a/sfctest/package-lock.json b/sfctest/package-lock.json
index 5d10fbc..f86ea08 100644
--- a/sfctest/package-lock.json
+++ b/sfctest/package-lock.json
@@ -105,9 +105,9 @@
       }
     },
     "@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": "4.8.3",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-4.8.3.tgz",
+      "integrity": "sha512-bQHV8R9Me8IaJoJ2vPG4rXcL7seB7YVuskr4f+f5RyOStSZetwzkWtoqDMl5erkBJy0lDRUnIR2WIkPiC0GJlg=="
     },
     "@resolver-engine/core": {
       "version": "0.2.1",
diff --git a/sfctest/package.json b/sfctest/package.json
old mode 100755
new mode 100644
index c94afdf..e418631
--- a/sfctest/package.json
+++ b/sfctest/package.json
@@ -12,7 +12,7 @@
     "flatten": "rm -rf contracts/Flattened.sol && truffle-flattener contracts/Staker.sol >> contracts/Flattened.sol"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "^2.3.0",
+    "@openzeppelin/contracts": "^4.8.3",
     "axios": "^0.19.2",
     "ethereumjs-util": "^6.2.0",
     "keythereum-pure-js": "^1.1.7",