diff --git a/server-cloudflare/models/tts.ts b/server-cloudflare/models/tts.ts
index 92e928d..21e7b24 100644
--- a/server-cloudflare/models/tts.ts
+++ b/server-cloudflare/models/tts.ts
@@ -7,11 +7,13 @@ export async function synthesizeSpeech(env: Env, text: string): Promise<Response
     throw new Error("Cloudflare AI binding is missing");
   }
 
+  const speaker = env.TTS_SPEAKER || "asteria";
+
   return env.AI.run(
     "@cf/deepgram/aura-2-en",
     {
       text,
-      speaker: "asteria",
+      speaker: speaker as Ai_Cf_Deepgram_Aura_2_En_Input["speaker"],
       encoding: "linear16",
       container: "none",
       sample_rate: AUDIO_OUTPUT_SAMPLE_RATE,
diff --git a/server-cloudflare/src/types.ts b/server-cloudflare/src/types.ts
index 01bce6c..1677657 100644
--- a/server-cloudflare/src/types.ts
+++ b/server-cloudflare/src/types.ts
@@ -2,6 +2,7 @@ export interface Env {
   AI: Ai;
   JWT_SECRET_KEY: string;
   OPENAI_API_KEY: string;
+  TTS_SPEAKER?: string;
   ELATO_OPENAI_MODEL?: string;
   ELATO_OPENAI_SYSTEM_PROMPT?: string;
   ELATO_OPENAI_FIRST_MESSAGE?: string;