diff --git a/configure.ac b/configure.ac
index de3a26264..b48a5c5f6 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],
-  [2024.01.01],
+  [2024.01.01-dev],
   [gfdl.climate.model.info@noaa.gov],
   [FMS],
   [https://www.github.com/NOAA-GFDL/FMS])