diff --git a/.changeset/tidy-phones-configure.md b/.changeset/tidy-phones-configure.md
new file mode 100644
index 000000000..b911b2236
--- /dev/null
+++ b/.changeset/tidy-phones-configure.md
@@ -0,0 +1,5 @@
+---
+'@livekit/agents-plugin-phonic': patch
+---
+
+Add `additionalParams` support to the Phonic realtime model.
diff --git a/plugins/phonic/package.json b/plugins/phonic/package.json
index fd32d39f0..7c8d93f0b 100644
--- a/plugins/phonic/package.json
+++ b/plugins/phonic/package.json
@@ -41,7 +41,7 @@
     "typescript": "^5.0.0"
   },
   "dependencies": {
-    "phonic": "^0.32.5"
+    "phonic": "^0.32.9"
   },
   "peerDependencies": {
     "@livekit/agents": "workspace:*",
diff --git a/plugins/phonic/src/realtime/realtime_model.ts b/plugins/phonic/src/realtime/realtime_model.ts
index 6ccfb2102..b2c3d245b 100644
--- a/plugins/phonic/src/realtime/realtime_model.ts
+++ b/plugins/phonic/src/realtime/realtime_model.ts
@@ -53,6 +53,7 @@ export interface RealtimeModelOptions {
   noInputPokeSec?: number;
   noInputPokeText?: string;
   noInputEndConversationSec?: number;
+  additionalParams?: NonNullable<Phonic.ConfigOptions['additional_params']>;
   forbidSpeechAfterToolCall?: string[];
   onConversationCreated?: (conversationId: string) => void;
   /** Set by `updateInstructions` via `voice.Agent` rather than the RealtimeModel constructor */
@@ -155,6 +156,10 @@ export class RealtimeModel extends llm.RealtimeModel {
        * Seconds of silence before ending conversation
        */
       noInputEndConversationSec?: number;
+      /**
+       * Additional runtime parameters forwarded to Phonic
+       */
+      additionalParams?: NonNullable<Phonic.ConfigOptions['additional_params']>;
       /**
        * Names of tools after which Phonic should NOT auto-generate a spoken reply.
        *
@@ -231,6 +236,7 @@ export class RealtimeModel extends llm.RealtimeModel {
       noInputPokeSec: options.noInputPokeSec,
       noInputPokeText: options.noInputPokeText,
       noInputEndConversationSec: options.noInputEndConversationSec,
+      additionalParams: options.additionalParams,
       forbidSpeechAfterToolCall: options.forbidSpeechAfterToolCall,
       onConversationCreated: options.onConversationCreated,
       connOptions: options.connOptions ?? DEFAULT_API_CONNECT_OPTIONS,
@@ -964,6 +970,7 @@ export class RealtimeSession extends llm.RealtimeSession {
       no_input_poke_sec: this.options.noInputPokeSec,
       no_input_poke_text: this.options.noInputPokeText,
       no_input_end_conversation_sec: this.options.noInputEndConversationSec,
+      additional_params: this.options.additionalParams,
       stream_ahead_of_real_time: true,
     };
   }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 82d1874db..7d4f3ae97 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1131,8 +1131,8 @@ importers:
   plugins/phonic:
     dependencies:
       phonic:
-        specifier: ^0.32.5
-        version: 0.32.7
+        specifier: ^0.32.9
+        version: 0.32.9
     devDependencies:
       '@livekit/agents':
         specifier: workspace:*
@@ -4456,8 +4456,8 @@ packages:
   pathe@2.0.3:
     resolution: {integrity: sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==}
 
-  phonic@0.32.7:
-    resolution: {integrity: sha512-F0rAJrj78QLTyBO05Z/w2wMw56CaA5IRge1U3BK1TA144esxMcvJ+3qXZGWf4BVf/UaTStBLLfcTrJOgflpa9Q==}
+  phonic@0.32.9:
+    resolution: {integrity: sha512-eYY7CY9PULChjxxs0xqS7qawDksu2tq4vW9raWC+gNOQi6iwvI+ibIcnKinp0HEP9nDgTNyil8/J+xodHERwPg==}
     engines: {node: '>=18.0.0'}
 
   picocolors@1.1.1:
@@ -8442,7 +8442,7 @@ snapshots:
 
   pathe@2.0.3: {}
 
-  phonic@0.32.7:
+  phonic@0.32.9:
     dependencies:
       ws: 8.20.0
     transitivePeerDependencies: