Not every change to your software requires an amendment to the ToS, EULA or PP. Where the change is encompassed by the language of the documents, no amendment is required. Conversely, if the change adds a new, or changes a current, feature, collects additional information or uses information differently and that is not reflected in these legal documents, then an amendment is likely required.
Ideally, your documents should constantly evolve, lockstep with your software’s evolution, and allow you to avoid the effort and cost involved in drafting new, or substantially amended, documents every few years. Where you believe that a software change is not reflected in your ToS, EULA or PP, I recommend consulting with your legal counsel to determine whether an amendment to these documents is needed.