diff --git a/package.json b/package.json
index b329627..4f9fd1c 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "@nomiclabs/hardhat-ethers": "^2.0.2",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
     "@openzeppelin": "git+https://github.com/tornadocash/openzeppelin-contracts.git#6e46aa6946a7f215e7604169ddf46e1aebea850f",
-    "@openzeppelin/contracts-upgradeable": "3.4.2",
+    "@openzeppelin/contracts-upgradeable": "4.4.2",
     "@typechain/ethers-v5": "^7.0.1",
     "@typechain/hardhat": "^2.3.0",
     "bignumber.js": "^9.0.0",
diff --git a/yarn.lock b/yarn.lock
index 000367a..eb47634 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -731,10 +731,10 @@
     "@types/sinon-chai" "^3.2.3"
     "@types/web3" "1.0.19"
 
-"@openzeppelin/contracts-upgradeable@3.4.2":
-  version "3.4.2"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-3.4.2.tgz#2c2a1b0fa748235a1f495b6489349776365c51b3"
-  integrity sha512-mDlBS17ymb2wpaLcrqRYdnBAmP1EwqhOXMvqWk2c5Q1N1pm5TkiCtXM9Xzznh4bYsQBq0aIWEkFFE2+iLSN1Tw==
+"@openzeppelin/contracts-upgradeable@4.4.2":
+  version "4.4.2"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-4.4.2.tgz#748a5986a02548ef541cabc2ce8c67a890044c40"
+  integrity sha512-bavxs18L47EmcdnL9I6DzsVSUJO+0/zD6zH7/6qG7QRBugvR3VNVZR+nMvuZlCNwuTTnCa3apR00PYzYr/efAw==
 
 "@openzeppelin@git+https://github.com/tornadocash/openzeppelin-contracts.git#6e46aa6946a7f215e7604169ddf46e1aebea850f":
   version "3.4.1-solc-0.7-2"