545
Security patches Computer security experts have assured individual computer users who have kept their operating systems updated that they are relatively safe , but urged companies and governments to make sure they apply security patches or upgrade to newer systems .
 ( patch vulnerability: apply,  security patches: patch) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( patch vulnerability: apply,  security patches: patch) 