diff --git a/configure.ac b/configure.ac
index c7fb56af..59fa5b01 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@ dnl Do not change user variables!
 dnl http://www.gnu.org/software/automake/manual/html_node/Flag-Variables-Ordering.html
 
 AC_PREREQ(2.61)
-AC_INIT([nghttp2], [1.3.5-DEV], [t-tujikawa@users.sourceforge.net])
+AC_INIT([nghttp2], [1.4.0], [t-tujikawa@users.sourceforge.net])
 AC_CONFIG_AUX_DIR([.])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
@@ -46,9 +46,9 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 dnl See versioning rule:
 dnl  http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
-AC_SUBST(LT_CURRENT, 15)
-AC_SUBST(LT_REVISION, 4)
-AC_SUBST(LT_AGE, 1)
+AC_SUBST(LT_CURRENT, 16)
+AC_SUBST(LT_REVISION, 0)
+AC_SUBST(LT_AGE, 2)
 
 major=`echo $PACKAGE_VERSION |cut -d. -f1 | sed -e "s/[^0-9]//g"`
 minor=`echo $PACKAGE_VERSION |cut -d. -f2 | sed -e "s/[^0-9]//g"`