diff --git a/src/Makefile.am b/src/Makefile.am
index 61e51de..5135d35 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,6 @@
 # This is _NOT_ the library release version, it's an API version.
 # Please read Chapter 6 "Library interface versions" of the libtool documentation before making any modification
-ABIS_LIBVERSION=3:0:0
+ABIS_LIBVERSION=4:0:0
 TRAU_LIBVERSION=0:0:0
 
 AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)