diff --git a/package.json b/package.json
index f4b3db97..5b9a177a 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "echidna": "yarn echidna:build && docker run -v \"$PWD\":/src pool-contracts/echidna"
   },
   "dependencies": {
-    "@openzeppelin/contracts-upgradeable": "3.4.0",
+    "@openzeppelin/contracts-upgradeable": "4.4.1",
     "@pooltogether/fixed-point": "1.0.0-beta.2",
     "@pooltogether/pooltogether-rng-contracts": "1.0.0",
     "@pooltogether/uniform-random-number": "1.0.0-beta.1",
diff --git a/yarn.lock b/yarn.lock
index 476bf033..c2ea2962 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -845,10 +845,10 @@
     "@types/sinon-chai" "^3.2.3"
     "@types/web3" "1.0.19"
 
-"@openzeppelin/contracts-upgradeable@3.4.0":
-  version "3.4.0"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-3.4.0.tgz#7674c73c643a509f1b90c509e3e72fe9aae02aeb"
-  integrity sha512-7wBcbukDqWZt/B1zjb7zyeWq+AC7rx7nGln7/hPxHdKd8PAiiteXd51Cp2KmGP8qaY0/TXh/fQLsA082LWp8Zw==
+"@openzeppelin/contracts-upgradeable@4.4.1":
+  version "4.4.1"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts-upgradeable/-/contracts-upgradeable-4.4.1.tgz#5d2c0e82cc1f94ee38a27572217ef103d5c3d0ef"
+  integrity sha512-84dUN+TBY42D52BzUc4RHxU4KORs8Ys7dj3nH0WX1QKtlS6rrN45gL+sxaotkPdCqFLVLPyj+kd8GfJ4puxVjA==
 
 "@pooltogether/fixed-point@1.0.0-beta.2":
   version "1.0.0-beta.2"