diff --git a/blkmaker.h b/blkmaker.h
index c76a0a2..6c1872c 100644
--- a/blkmaker.h
+++ b/blkmaker.h
@@ -7,7 +7,7 @@
 
 #include <blktemplate.h>
 
-#define BLKMAKER_VERSION (1L)
+#define BLKMAKER_VERSION (2L)
 #define BLKMAKER_MAX_BLOCK_VERSION (2)
 
 extern bool (*blkmk_sha256_impl)(void *hash_out, const void *data, size_t datasz);
diff --git a/configure.ac b/configure.ac
index 6e3e764..26729b2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,7 +13,7 @@ m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 LT_INIT([disable-static])
 
 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
-AC_SUBST([LIBBLKMAKER_SO_VERSION], [1:1:1])
+AC_SUBST([LIBBLKMAKER_SO_VERSION], [2:0:2])
 AC_SUBST([LIBBLKMAKER_API_VERSION], [0.1])
 
 AC_CONFIG_FILES([Makefile