diff --git a/odc/geo/_version.py b/odc/geo/_version.py
index dbf8b11a..ccc1d71a 100644
--- a/odc/geo/_version.py
+++ b/odc/geo/_version.py
@@ -1,2 +1,2 @@
 """version information only."""
-__version__ = "0.4.2a1"
+__version__ = "0.4.2rc0"