Some things to consider:
What made today different from another day? What, as someone asking, would I not know? I know you probably went and typed on a keyboard and ate lunch, but I don't know that you finally solved that bug in production and feel awesome or that Steve from accounting turned up late, giggling, with Dave and they've been making excuses to see each other at work for the last few weeks.
What's different? What's changed? Over time these things fit into a larger story, the buildup of Steve and Dave's romance has been happening for weeks.
What's relatable for the person asking? If I'm another dev then telling me about that new library you got to use that's fun might be interesting, for others maybe not. Although you can often find interesting ways of talking about it to someone who is inquisitive, I talk a lot about bits of tech to my wife and explain how things work and why things are as they are, sometimes it's relevant to what she's doing. In return she's explained a lot about NMR machines and biology to me.
For practice, perhaps, I'm a developer but probably not using the same tech stack. How was your week? Since I don't know anything about your office or things, imagine you'd already told me what had happened the week before. What's changed, what's new?
Finally, it's also OK if not much really happened. But if nothing really happened, was that good or bad for you? Why? Was it a quiet week and that's different, or are the quiet weeks becoming less interesting? Is it quiet but there's a buildup of expected work coming in a few weeks?