diff --git a/lib/plugins/matrix/send.js b/lib/plugins/matrix/send.js
index ac2df5ebd6..49e24e1bce 100644
--- a/lib/plugins/matrix/send.js
+++ b/lib/plugins/matrix/send.js
@@ -9,20 +9,25 @@ function send(
   room,
   accessToken,
   retries = 3,
-  backoff = 5000
+  backoff = 5000,
+  transactionId
 ) {
+  if (!transactionId) {
+    transactionId = `ssio-${Date.now()}`;
+  }
   const retryCodes = new Set([408, 429, 500, 503]);
   return new Promise((resolve, reject) => {
     const request = _request(
       {
         host,
         port: 443,
-        path: `/_matrix/client/r0/rooms/${room}/send/m.room.message?access_token=${accessToken}`,
+        path: `/_matrix/client/v3/rooms/${room}/send/m.room.message/${transactionId}`,
         headers: {
+          Authorization: `Bearer ${accessToken}`,
           'Content-Type': 'application/json',
           'Content-Length': Buffer.byteLength(JSON.stringify(data), 'utf8')
         },
-        method: 'POST'
+        method: 'PUT'
       },
       res => {
         const { statusCode, statusMessage } = res;
@@ -36,7 +41,8 @@ function send(
                 room,
                 accessToken,
                 retries - 1,
-                backoff * 2
+                backoff * 2,
+                transactionId
               );
             }, backoff);
           } else {