```\n/// @dev Only allow access from the owning node address\nmodifier onlyMinipoolOwner() {\n    // Only the node operator can upgrade\n    address withdrawalAddress = rocketStorage.getNodeWithdrawalAddress(nodeAddress);\n    require(msg.sender == nodeAddress || msg.sender == withdrawalAddress, "Only the node operator can access this method");\n    \_;\n}\n```\n