diff --git a/src/backend/config.py b/src/backend/config.py
index 4e35e3b9..77e56ef6 100644
--- a/src/backend/config.py
+++ b/src/backend/config.py
@@ -191,7 +191,7 @@
 # picker). DEFAULT_VOICE_NAME is the historical hardcoded default and the
 # fallback for an unset or no-longer-valid persisted value.
 DEFAULT_VOICE_NAME = "Kore"
-GEMINI_VOICE_NAMES = ("Kore", "Zephyr", "Puck", "Aoede", "Charon", "Fenrir")
+GEMINI_VOICE_NAMES = ("Kore", "Zephyr", "Puck", "Aoede", "Charon", "Fenrir", "Gacrux")
 
 # Gemini text/audio models (#1130). Hardcoded `gemini-2.0-flash` was retired by
 # Google (404 NOT_FOUND) with no config escape hatch — these env overrides make
diff --git a/src/frontend/src/constants/voices.js b/src/frontend/src/constants/voices.js
index f634dc30..9edadc7a 100644
--- a/src/frontend/src/constants/voices.js
+++ b/src/frontend/src/constants/voices.js
@@ -11,6 +11,7 @@ export const VOICES = [
   { id: 'Aoede', label: 'Aoede — Breezy' },
   { id: 'Charon', label: 'Charon — Informational' },
   { id: 'Fenrir', label: 'Fenrir — Excitable' },
+  { id: 'Gacrux', label: 'Gacrux — Mature' },
 ]
 
 export const VOICE_IDS = VOICES.map((v) => v.id)
diff --git a/tests/unit/test_28_voip_voice_config.py b/tests/unit/test_28_voip_voice_config.py
index f9ca5b98..baf7ff1d 100644
--- a/tests/unit/test_28_voip_voice_config.py
+++ b/tests/unit/test_28_voip_voice_config.py
@@ -143,7 +143,7 @@ def test_backend_defaults(self):
         assert config.DEFAULT_VOICE_NAME == "Kore"
         assert config.DEFAULT_VOICE_NAME in config.GEMINI_VOICE_NAMES
         assert config.GEMINI_VOICE_NAMES == (
-            "Kore", "Zephyr", "Puck", "Aoede", "Charon", "Fenrir",
+            "Kore", "Zephyr", "Puck", "Aoede", "Charon", "Fenrir", "Gacrux",
         )
 
     def test_frontend_voice_list_matches_backend(self):