diff --git a/src/gb/Makefile.am b/src/gb/Makefile.am
index 2ccb757..018342c 100644
--- a/src/gb/Makefile.am
+++ b/src/gb/Makefile.am
@@ -1,7 +1,7 @@
 # This is _NOT_ the library release version, it's an API version.
 # Please read chapter "Library interface versions" of the libtool documentation
 # before making any modifications: https://www.gnu.org/software/libtool/manual/html_node/Versioning.html
-LIBVERSION=12:0:0
+LIBVERSION=13:0:1
 
 AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include
 AM_CFLAGS = -Wall ${GCC_FVISIBILITY_HIDDEN} -fno-strict-aliasing \