diff --git a/tasks/release.py b/tasks/release.py
index 9d2ce03afe866..cabf0568e9d20 100644
--- a/tasks/release.py
+++ b/tasks/release.py
@@ -449,9 +449,12 @@ def create_rc(ctx, major_versions="6,7", patch_version=False, upstream="origin",
     # Step 4 - If slack workflow webhook is provided, send a slack message
     if slack_webhook:
         print(color_message("Sending slack notification", "bold"))
-        ctx.run(
-            f"curl -X POST -H 'Content-Type: application/json' --data '{{\"pr_url\":\"{pr_url}\"}}' {slack_webhook}"
-        )
+        payload = {
+            "pr_url": pr_url,
+            "version": str(new_highest_version),
+        }
+
+        ctx.run(f"curl -X POST -H 'Content-Type: application/json' --data '{json.dumps(payload)}' {slack_webhook}")
 
 
 @task