Crack open your Gemfile, package.json, setup.py, or whatever file your language/dependency manager uses.
Give it a slow scan. Ask yourself:
Do you still need everything in there?
Does anything need to be updated?
Can you reduce a production dependency to a development/test one?
Rubyists: maybe run bundler-audit to automatically check for gems with known vulnerabilites.
Is your file nicely laid out and sorted alphabetically? Should it be?
Give it 20 minutes. Celebrate your continued focus on code quality. Maybe post on the forum.