diff --git a/action.js b/action.js
index 13061d0..78fd708 100644
--- a/action.js
+++ b/action.js
@@ -11,7 +11,7 @@ const sendFile = async (urlPath, data) => {
   let r = await fetch(`${repoBaseUrl}/${urlPath}`, {
     method: "PUT",
     headers: {
-      Authorization: `Basic ${process.env.INPUT_REPO_USER}:${process.env.INPUT_REPO_PASS}`,
+      Authorization: `Basic ${Buffer.from(`${process.env.INPUT_REPO_USER}:${process.env.INPUT_REPO_PASS}`).toString("base64")}`,
     },
     body: data,
   });