diff --git a/_metadata.py b/_metadata.py
index 4bf3615..012e8ef 100644
--- a/_metadata.py
+++ b/_metadata.py
@@ -1,2 +1,2 @@
-__extension_version__ = "0.21.1"
+__extension_version__ = "0.21.1rc0"
 __extension_name__ = "pytket-braket"