diff --git a/lib/clouddrop-upload.js b/lib/clouddrop-upload.js
index 56fe3d3..16a57c0 100644
--- a/lib/clouddrop-upload.js
+++ b/lib/clouddrop-upload.js
@@ -5,6 +5,7 @@ const { request, Agent } = require('undici');
 
 const BASE_URL = 'https://clouddrop.cc';
 const API_BASE = `${BASE_URL}/api/cloud`;
+const CHUNK_UPLOAD_BASE = 'https://upload.clouddrop.cc/api/cloud';
 const USER_AGENT = 'multi-hoster-uploader/1.0';
 
 const SIMPLE_UPLOAD_LIMIT = 16 * 1024 * 1024; // 16 MB
@@ -169,7 +170,7 @@ class ClouddropUploader {
 
         if (throttle) await throttle.consume(thisChunkSize, signal);
 
-        const chunkRes = await request(`${API_BASE}/upload/${sessionId}/chunk/${i}`, {
+        const chunkRes = await request(`${CHUNK_UPLOAD_BASE}/upload/${sessionId}/chunk/${i}`, {
           method: 'PUT',
           dispatcher: clouddropAgent,
           signal,