diff --git a/package.json b/package.json
index 66ca1df7..f359700f 100644
--- a/package.json
+++ b/package.json
@@ -82,7 +82,7 @@
     "@gnosis.pm/owl-token": "^4.0.0",
     "@gnosis.pm/solidity-data-structures": "1.3.5",
     "@gnosis.pm/util-contracts": "2.0.7",
-    "@openzeppelin/contracts": "=2.5.1",
+    "@openzeppelin/contracts": "=4.0.0",
     "@truffle/contract": "^4.3.9",
     "@typechain/truffle-v5": "^2.0.2",
     "@typechain/web3-v1": "^1.0.0",
diff --git a/yarn.lock b/yarn.lock
index 163b4f10..ef3497f8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -526,10 +526,10 @@
     "@nodelib/fs.scandir" "2.1.3"
     fastq "^1.6.0"
 
-"@openzeppelin/contracts@=2.5.1":
-  version "2.5.1"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-2.5.1.tgz#c76e3fc57aa224da3718ec351812a4251289db31"
-  integrity sha512-qIy6tLx8rtybEsIOAlrM4J/85s2q2nPkDqj/Rx46VakBZ0LwtFhXIVub96LXHczQX0vaqmAueDqNPXtbSXSaYQ==
+"@openzeppelin/contracts@=4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.0.0.tgz#54d1de30911635020c383cb73b160b698e7ae179"
+  integrity sha512-UcIJl/vUVjTr3H1yYXZi7Sr2PlXzBEHVUJKOUlVyzyy0FI8oQCCy0Wx+BuK/fojdnmLeMvUk4KUvhKUybP+C7Q==
 
 "@resolver-engine/core@^0.2.1":
   version "0.2.1"