diff --git a/server/src/routes.js b/server/src/routes.js
index 360f2a0..e5fa94b 100644
--- a/server/src/routes.js
+++ b/server/src/routes.js
@@ -14,7 +14,13 @@ const ALLOWED_MIME = new Set(['image/jpeg', 'image/png', 'image/webp'])
 
 // GET /api/caption?date=YYYY-MM-DD — draft a one-line caption from that
 // day's context. Editable client-side before it's ever composited in.
+// Explicitly uncacheable: the same date can legitimately draft a
+// different caption call to call (goonk's underlying git/spotify state
+// changes through the day, and the phrasing itself is randomized), so any
+// browser/CDN/reverse-proxy layer caching this by URL would silently
+// serve stale activity data.
 apiRouter.get('/caption', async (req, res) => {
+  res.setHeader('Cache-Control', 'no-store')
   const date = /^\d{4}-\d{2}-\d{2}$/.test(req.query.date) ? req.query.date : new Date().toISOString().slice(0, 10)
   const caption = await draftCaption(date)
   res.json({ caption })