diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fc853348..c9b8f5c2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Install Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node
         with:
           node-version: ${{ matrix.node-version }}
 
diff --git a/src/chatgpt-api.ts b/src/chatgpt-api.ts
index 3d5ba277..b44cce2d 100644
--- a/src/chatgpt-api.ts
+++ b/src/chatgpt-api.ts
@@ -125,6 +125,7 @@ export class ChatGPTAPI {
    * @param opts.timeoutMs - Optional timeout in milliseconds (defaults to no timeout)
    * @param opts.onProgress - Optional callback which will be invoked every time the partial response is updated
    * @param opts.abortSignal - Optional callback used to abort the underlying `fetch` call using an [AbortController](https://developer.mozilla.org/en-US/docs/Web/API/AbortController)
+   * @param completionParams - Optional overrides to send to the [OpenAI chat completion API](https://platform.openai.com/docs/api-reference/chat/create). Options like `temperature` and `presence_penalty` can be tweaked to change the personality of the assistant.
    *
    * @returns The response from ChatGPT
    */
@@ -137,7 +138,8 @@ export class ChatGPTAPI {
       messageId = uuidv4(),
       timeoutMs,
       onProgress,
-      stream = onProgress ? true : false
+      stream = onProgress ? true : false,
+      completionParams
     } = opts
 
     let { abortSignal } = opts
@@ -178,6 +180,7 @@ export class ChatGPTAPI {
         const body = {
           max_tokens: maxTokens,
           ...this._completionParams,
+          ...completionParams,
           messages,
           stream
         }
diff --git a/src/types.ts b/src/types.ts
index f37223a4..fd23cf7b 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -14,7 +14,7 @@ export type ChatGPTAPIOptions = {
   debug?: boolean
 
   completionParams?: Partial<
-    Omit<openai.CreateChatCompletionRequest, 'messages' | 'n'>
+    Omit<openai.CreateChatCompletionRequest, 'messages' | 'n' | 'stream'>
   >
 
   systemMessage?: string
@@ -42,6 +42,9 @@ export type SendMessageOptions = {
   timeoutMs?: number
   onProgress?: (partialResponse: ChatMessage) => void
   abortSignal?: AbortSignal
+  completionParams?: Partial<
+    Omit<openai.CreateChatCompletionRequest, 'messages' | 'n' | 'stream'>
+  >
 }
 
 export type MessageActionType = 'next' | 'variant'