diff --git a/configure.ac b/configure.ac
index 7797c074b..61f42589e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.50])
-AC_INIT([shairport-sync], [4.2], [4265913+mikebrady@users.noreply.github.com])
+AC_INIT([shairport-sync], [4.2.1-dev], [4265913+mikebrady@users.noreply.github.com])
 AM_INIT_AUTOMAKE([subdir-objects])
 AC_CONFIG_SRCDIR([shairport.c])
 AC_CONFIG_HEADERS([config.h])