diff --git a/pyproject.toml b/pyproject.toml
index ea6b3ba..03114b9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "maap-api-nasa"
-version = "3.2.0a3"
+version = "4.0.0rc1"
 description = "NASA Python implementation of the MAAP API specification"
 authors = ["MAAP-Project Platform <platform@MAAP-Project.github.com>"]
 license = "Apache 2.0"