If the project manager realizes that some risks have not been updated recently, they should review the risk register to check for new risks and ensure that all risks are accurately documented and updated.
The risk register is a document that contains information about the identified risks, their analysis, and their response plans. It is updated throughout the project life cycle as new risks emerge, existing risks change, or risks are closed. The project manager should review the risk register regularly to ensure that the project data is accurate and reflects the current risk situation. Reviewing the risk register also helps the project manager to identify any new risks that may have occurred since the last update, and to plan appropriate responses for them. References: PMI, Project Risk Management, 2nd edition, 2019, p. 67-681