diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 9785f7c4a..3218ab333 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.78.0"
+  ".": "4.78.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbc82e722..320d00140 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 4.78.1 (2025-01-10)
+
+Full Changelog: [v4.78.0...v4.78.1](https://github.com/openai/openai-node/compare/v4.78.0...v4.78.1)
+
+### Bug Fixes
+
+* send correct Accept header for certain endpoints ([#1257](https://github.com/openai/openai-node/issues/1257)) ([8756693](https://github.com/openai/openai-node/commit/8756693c5690b16045cdd8d33636fe7643d45f3a))
+
 ## 4.78.0 (2025-01-09)
 
 Full Changelog: [v4.77.4...v4.78.0](https://github.com/openai/openai-node/compare/v4.77.4...v4.78.0)
diff --git a/jsr.json b/jsr.json
index e26f2d5d8..257faa02d 100644
--- a/jsr.json
+++ b/jsr.json
@@ -1,6 +1,6 @@
 {
   "name": "@openai/openai",
-  "version": "4.78.0",
+  "version": "4.78.1",
   "exports": "./index.ts",
   "publish": {
     "exclude": [
diff --git a/package.json b/package.json
index ab06be9cf..ff6ec16bc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "openai",
-  "version": "4.78.0",
+  "version": "4.78.1",
   "description": "The official TypeScript library for the OpenAI API",
   "author": "OpenAI <support@openai.com>",
   "types": "dist/index.d.ts",
diff --git a/src/resources/audio/speech.ts b/src/resources/audio/speech.ts
index 1cda80f79..bd2ed9f65 100644
--- a/src/resources/audio/speech.ts
+++ b/src/resources/audio/speech.ts
@@ -9,7 +9,12 @@ export class Speech extends APIResource {
    * Generates audio from the input text.
    */
   create(body: SpeechCreateParams, options?: Core.RequestOptions): Core.APIPromise<Response> {
-    return this._client.post('/audio/speech', { body, ...options, __binaryResponse: true });
+    return this._client.post('/audio/speech', {
+      body,
+      ...options,
+      headers: { Accept: 'application/octet-stream', ...options?.headers },
+      __binaryResponse: true,
+    });
   }
 }
 
diff --git a/src/resources/files.ts b/src/resources/files.ts
index 42a7bdfba..43708310b 100644
--- a/src/resources/files.ts
+++ b/src/resources/files.ts
@@ -69,7 +69,11 @@ export class Files extends APIResource {
    * Returns the contents of the specified file.
    */
   content(fileId: string, options?: Core.RequestOptions): Core.APIPromise<Response> {
-    return this._client.get(`/files/${fileId}/content`, { ...options, __binaryResponse: true });
+    return this._client.get(`/files/${fileId}/content`, {
+      ...options,
+      headers: { Accept: 'application/binary', ...options?.headers },
+      __binaryResponse: true,
+    });
   }
 
   /**
@@ -78,10 +82,7 @@ export class Files extends APIResource {
    * @deprecated The `.content()` method should be used instead
    */
   retrieveContent(fileId: string, options?: Core.RequestOptions): Core.APIPromise<string> {
-    return this._client.get(`/files/${fileId}/content`, {
-      ...options,
-      headers: { Accept: 'application/json', ...options?.headers },
-    });
+    return this._client.get(`/files/${fileId}/content`, options);
   }
 
   /**
diff --git a/src/version.ts b/src/version.ts
index 7ab855b86..a8ac58ba2 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '4.78.0'; // x-release-please-version
+export const VERSION = '4.78.1'; // x-release-please-version