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It urges those 4.x users , not ready to update to the 5.0 branch , to install the WordPress 4.9.9 security update ( also released this week ) , which addresses similar bugs .
 patch vulnerability: addresses
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: addresses