diff --git a/backend/app/core/config.py b/backend/app/core/config.py
index 809655e..0c744cb 100644
--- a/backend/app/core/config.py
+++ b/backend/app/core/config.py
@@ -222,7 +222,7 @@ class Settings(BaseSettings):
     # Gemini TTS Model Options
     gemini_tts_models: dict[str, str] = {
         "flash": "gemini-3.1-flash-tts-preview",  # Fast, cost-efficient
-        "pro": "gemini-3.1-pro-tts-preview",       # Higher quality
+        "pro": "gemini-2.5-pro-preview-tts",       # Higher quality
     }
 
     # Gemini TTS Style Presets - prompts prepended to text for style control
diff --git a/backend/app/tasks/tts_synthesis.py b/backend/app/tasks/tts_synthesis.py
index bd76b4f..0f97320 100644
--- a/backend/app/tasks/tts_synthesis.py
+++ b/backend/app/tasks/tts_synthesis.py
@@ -32,7 +32,7 @@ _TTS_PROVIDER_MODEL_MAP = {
 
 _TTS_MODEL_STRINGS = {
     "flash": "gemini-3.1-flash-tts-preview",
-    "pro": "gemini-3.1-pro-tts-preview",
+    "pro": "gemini-2.5-pro-preview-tts",
     "standard": "standard",
     "wavenet": "wavenet",
     "neural2": "neural2",