diff --git a/apps/OpenSignServer/cloud/parsefunction/getSignedUrl.js b/apps/OpenSignServer/cloud/parsefunction/getSignedUrl.js
index 8753f30a6..24b15de21 100644
--- a/apps/OpenSignServer/cloud/parsefunction/getSignedUrl.js
+++ b/apps/OpenSignServer/cloud/parsefunction/getSignedUrl.js
@@ -8,7 +8,7 @@ export default function getPresignedUrl(url, adapter) {
   AWS.config.update({ credentials: credentials, region: adapter?.region || process.env.DO_REGION });
   const spacesEndpoint = adapter?.endpoint || new AWS.Endpoint(process.env.DO_ENDPOINT);
 
-  const s3 = new AWS.S3({ endpoint: spacesEndpoint });
+  const s3 = new AWS.S3({ endpoint: spacesEndpoint, signatureVersion: "v4" });
 
   // Create a new URL object
   const parsedUrl = new URL(url);
diff --git a/apps/OpenSignServer/cloud/parsefunction/uploadFiletoS3.js b/apps/OpenSignServer/cloud/parsefunction/uploadFiletoS3.js
index d17f30420..3fe0a6d2a 100644
--- a/apps/OpenSignServer/cloud/parsefunction/uploadFiletoS3.js
+++ b/apps/OpenSignServer/cloud/parsefunction/uploadFiletoS3.js
@@ -14,6 +14,7 @@ async function uploadFileToS3(buffer, fileName, mimeType, adapter) {
     client = new S3Client({
       region: adapter?.region,
       credentials: { accessKeyId: adapter?.accessKeyId, secretAccessKey: adapter?.secretAccessKey },
+      signatureVersion: 'v4'
     });
   }
   const prefixId = crypto.randomBytes(16).toString('hex');