diff --git a/.changeset/lazy-eagles-cough.md b/.changeset/lazy-eagles-cough.md
new file mode 100644
index 00000000..2446ed45
--- /dev/null
+++ b/.changeset/lazy-eagles-cough.md
@@ -0,0 +1,5 @@
+---
+"@absmach/magistrala-sdk": patch
+---
+
+update sending message
diff --git a/src/messages.ts b/src/messages.ts
index 7b23ab99..054a7042 100644
--- a/src/messages.ts
+++ b/src/messages.ts
@@ -62,7 +62,7 @@ export default class Messages {
       method: "POST",
       headers: {
         "Content-Type": this.contentType,
-        Authorization: `client ${clientKey}`,
+        Authorization: `Client ${clientKey}`,
       },
       body: msg,
     };