diff --git a/src/gsm/Makefile.am b/src/gsm/Makefile.am
index 3162a7f..46698cd 100644
--- a/src/gsm/Makefile.am
+++ b/src/gsm/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
-LIBVERSION=4:0:0
+LIBVERSION=5:0:0
 
 AM_CFLAGS = -Wall ${GCC_FVISIBILITY_HIDDEN} $(all_includes) -I$(top_srcdir)/include