diff --git a/ChangeLog b/ChangeLog
index 436b43b..b535157 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+ver 3.21:
+	Add constant for Bluetooth socket options level.
+
 ver 3.20:
 	Add support for inquiry transmit power level.
 
diff --git a/configure.in b/configure.in
index cca4829..083dcaa 100644
--- a/configure.in
+++ b/configure.in
@@ -1,7 +1,7 @@
 AC_PREREQ(2.50)
 AC_INIT()
 
-AM_INIT_AUTOMAKE(bluez-libs, 3.20)
+AM_INIT_AUTOMAKE(bluez-libs, 3.21)
 AM_CONFIG_HEADER(config.h)
 
 AM_MAINTAINER_MODE
diff --git a/src/Makefile.am b/src/Makefile.am
index 27d7dec..5f021b3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,7 +2,7 @@
 lib_LTLIBRARIES = libbluetooth.la
 
 libbluetooth_la_SOURCES = bluetooth.c hci.c sdp.c
-libbluetooth_la_LDFLAGS = -version-info 11:0:9
+libbluetooth_la_LDFLAGS = -version-info 11:1:9
 
 INCLUDES = -I$(top_builddir)/include