diff --git a/configure.ac b/configure.ac
index 5a9aff17c..3b242c001 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@ AC_PREREQ([2.69])
 
 # Initialize with name, version, and support email address.
 AC_INIT([GFDL FMS Library],
-  [2023.03.00],
+  [2023.03.00-dev],
   [gfdl.climate.model.info@noaa.gov],
   [FMS],
   [https://www.github.com/NOAA-GFDL/FMS])