diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
index 3508d27..3c16ca5 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
@@ -630,6 +630,9 @@ function setTheme(theme) {
     themeToggleBtn.textContent = next === "dark" ? "☀️ Light" : "🌙 Dark";
     themeToggleBtn.title = next === "dark" ? "Switch to light mode" : "Switch to dark mode";
   }
+  // Invalidate cached bookmark chip colours so they pick up the new theme palette.
+  if (typeof bmRevision !== "undefined") bmRevision++;
+  if (typeof scheduleSpectrumDraw === "function") scheduleSpectrumDraw();
 }
 
 // ── Style / palette system ────────────────────────────────────────────────────