diff --git a/configure.ac b/configure.ac
index f7993203..a22de8fa 100755
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_INIT([PhyML],esyscmd([sh -c "echo "3.3." | tr -d '\n' ; echo "20211118" | tr -d '\n'"]),[guindon@lirmm.fr])
+AC_INIT([PhyML],esyscmd([sh -c "echo "3.3." | tr -d '\n' ; echo "20211231" | tr -d '\n'"]),[guindon@lirmm.fr])
 AM_INIT_AUTOMAKE([foreign])
 AC_CONFIG_SRCDIR([src/main.c],[doc/phyml-manual.tex])
 AC_CONFIG_HEADERS([config.h])