We have been ISO 27001 certified for 4 years now. We had generally the same risks each year and the existing controls are sufficient in mitigating them. At this point, we're really struggling to identify new risks to mitigate and apply a risk treatment to each year. In your experience, is it possible to get by with just "existing controls are sufficient in mitigating this risk" for all risks that need mitigating? Or is it an absolute must to show a current risk treatment plan each year?
ISO 27001 requires risks to be periodically reviewed, or when situations that may impact the business occur, but it is not mandatory to identify new risks or create new risk treatment plan.
However, it is highly unlikely that risks haven’t changed for so long (this situation will very probably call the attention of the certification auditor).
Some issues you have to consider on risk assessment that may trigger new risks are: new products, new technology, change of the location, change of customer profile, change of employees profile, new compan y strategy, etc.