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
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 patch vulnerability: apply