diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c4354d..90d2122 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- A media player renamed in Home Assistant (new entity id) no longer disappears
+  from the sidebar until the page is reloaded.
+
 ### Changed
 
 - Now in the HACS default store: install by searching for Sidebar Mini Player in HACS, no custom repository needed. README badge and install steps updated.
diff --git a/ha-sidebar-mini-player.js b/ha-sidebar-mini-player.js
index 792c30f..07d0af2 100644
--- a/ha-sidebar-mini-player.js
+++ b/ha-sidebar-mini-player.js
@@ -309,15 +309,16 @@
   /**
    * Cached list of candidate media_player ids. A large install has thousands
    * of entities; we only re-list hass.states' keys when the states object
-   * changed AND its key count changed (entity added/removed), or the config
-   * changed. Otherwise each tick only looks at the cached media players.
+   * changed AND its key count changed (entity added/removed) or a cached
+   * player is gone (entity renamed: one id out, one in, same count), or the
+   * config changed. Otherwise each tick only looks at the cached media players.
    */
   const cache = { states: null, count: -1, ids: [] };
   function mediaPlayerIds(states) {
     if (states !== cache.states) {
       cache.states = states;
       const keys = Object.keys(states);
-      if (keys.length !== cache.count) {
+      if (keys.length !== cache.count || cache.ids.some((id) => !(id in states))) {
         cache.count = keys.length;
         cache.ids = keys.filter((id) => id.startsWith("media_player.") && allowed(id));
       }
diff --git a/test/test.js b/test/test.js
index 6890a91..df8439f 100644
--- a/test/test.js
+++ b/test/test.js
@@ -308,6 +308,13 @@ function setup(layoutHtml, statesFile = FIXTURE, prep = null, opts = {}) {
     // New Speaker is now the most recent playing -> auto focus (no click choice made in this run).
     check("V3 newly added entity discovered + auto-focused (5 active)", q3(".spk").textContent === "New Speaker" && R3.querySelectorAll(".mini").length === 4,
       `${q3(".spk").textContent}, minis=${R3.querySelectorAll(".mini").length}`);
+    // Entity renamed (one id out, one in, so the key count stays the same) -> still shown.
+    const stR = { ...t3.ha.hass.states };
+    delete stR["media_player.new_speaker"];
+    stR["media_player.renamed_speaker"] = { entity_id: "media_player.renamed_speaker", state: "playing", last_changed: new Date().toISOString(), attributes: { friendly_name: "Renamed Speaker", media_title: "Hello" } };
+    t3.ha.hass = { ...t3.hass, states: stR }; await sleep(1200);
+    check("V3 renamed entity (same entity count) picked up", q3(".spk").textContent === "Renamed Speaker" && R3.querySelectorAll(".mini").length === 4,
+      `${q3(".spk").textContent}, minis=${R3.querySelectorAll(".mini").length}`);
     // Cap: add 3 more -> 8 active, 7 others -> 4 cards + "+3 more" at the top.
     const st4 = { ...t3.ha.hass.states };
     for (const k of ["a", "b", "c"]) st4["media_player.extra_" + k] = { entity_id: "media_player.extra_" + k, state: "paused", last_changed: new Date(Date.now() - 4 * 60000).toISOString() /* < 5 min */, attributes: { friendly_name: "Extra " + k.toUpperCase(), media_title: "T" + k } };