diff --git a/README b/README
index d926f625..64e9f2d6 100644
--- a/README
+++ b/README
@@ -4,7 +4,7 @@
           \__\__/\____/\_____/__/ ____  ___
                 / _/ /    \    \ /  _ \/ _/
                /  \_/   / /   \ \   __/  \__
-               \____/____/\_____/_____/____/v0.3.1
+               \____/____/\_____/_____/____/v0.4.0
 
 Description:
 ============
diff --git a/README.mux b/README.mux
index ff157a81..ab77da51 100644
--- a/README.mux
+++ b/README.mux
@@ -1,7 +1,7 @@
           __   __  ____  ____  ____  __ __  _     __ __
          /  \\/  \/  _ \/  _ \/  _ \/  \  \/ \___/_ / _\
          \       /   __/  _  \   __/      /  /  (_/  /__
-          \__\__/\_____/_____/__/  \__//_/\_____/__/___/v0.1.1
+          \__\__/\_____/_____/__/  \__//_/\_____/__/___/v0.2.0
 
 
 Description:
diff --git a/configure.ac b/configure.ac
index a9238eb5..2d5d24c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([libwebp], [0.3.1],
+AC_INIT([libwebp], [0.4.0],
         [http://code.google.com/p/webp/issues],,
         [http://developers.google.com/speed/webp])
 AC_CANONICAL_TARGET
diff --git a/src/Makefile.am b/src/Makefile.am
index 8f3557c0..e570d40d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -36,7 +36,7 @@ libwebp_la_LIBADD += utils/libwebputils.la
 # other than the ones listed on the command line, i.e., after linking, it will
 # not have unresolved symbols. Some platforms (Windows among them) require all
 # symbols in shared libraries to be resolved at library creation.
-libwebp_la_LDFLAGS = -no-undefined -version-info 4:3:0
+libwebp_la_LDFLAGS = -no-undefined -version-info 5:0:0
 libwebpincludedir = $(includedir)/webp
 pkgconfig_DATA = libwebp.pc
 
@@ -48,7 +48,7 @@ if BUILD_LIBWEBPDECODER
   libwebpdecoder_la_LIBADD += dsp/libwebpdspdecode.la
   libwebpdecoder_la_LIBADD += utils/libwebputilsdecode.la
 
-  libwebpdecoder_la_LDFLAGS = -no-undefined -version-info 0:1:0
+  libwebpdecoder_la_LDFLAGS = -no-undefined -version-info 1:0:0
   pkgconfig_DATA += libwebpdecoder.pc
 endif
 
diff --git a/src/dec/vp8i.h b/src/dec/vp8i.h
index 410b403c..3f4cf297 100644
--- a/src/dec/vp8i.h
+++ b/src/dec/vp8i.h
@@ -30,8 +30,8 @@ extern "C" {
 
 // version numbers
 #define DEC_MAJ_VERSION 0
-#define DEC_MIN_VERSION 3
-#define DEC_REV_VERSION 1
+#define DEC_MIN_VERSION 4
+#define DEC_REV_VERSION 0
 
 // intra prediction modes
 enum { B_DC_PRED = 0,   // 4x4 modes
diff --git a/src/demux/Makefile.am b/src/demux/Makefile.am
index 7d4d2285..0227a233 100644
--- a/src/demux/Makefile.am
+++ b/src/demux/Makefile.am
@@ -10,6 +10,6 @@ libwebpdemuxinclude_HEADERS += ../webp/mux_types.h
 libwebpdemuxinclude_HEADERS += ../webp/types.h
 
 libwebpdemux_la_LIBADD = ../libwebp.la
-libwebpdemux_la_LDFLAGS = -no-undefined -version-info 0:1:0
+libwebpdemux_la_LDFLAGS = -no-undefined -version-info 1:0:0
 libwebpdemuxincludedir = $(includedir)/webp
 pkgconfig_DATA = libwebpdemux.pc
diff --git a/src/demux/demux.c b/src/demux/demux.c
index e9a81eaa..f66ac6d8 100644
--- a/src/demux/demux.c
+++ b/src/demux/demux.c
@@ -24,8 +24,8 @@
 #include "../webp/format_constants.h"
 
 #define DMUX_MAJ_VERSION 0
-#define DMUX_MIN_VERSION 1
-#define DMUX_REV_VERSION 1
+#define DMUX_MIN_VERSION 2
+#define DMUX_REV_VERSION 0
 
 typedef struct {
   size_t start_;        // start location of the data
diff --git a/src/enc/vp8enci.h b/src/enc/vp8enci.h
index 20d0af92..71adf6c3 100644
--- a/src/enc/vp8enci.h
+++ b/src/enc/vp8enci.h
@@ -29,8 +29,8 @@ extern "C" {
 
 // version numbers
 #define ENC_MAJ_VERSION 0
-#define ENC_MIN_VERSION 3
-#define ENC_REV_VERSION 1
+#define ENC_MIN_VERSION 4
+#define ENC_REV_VERSION 0
 
 // intra prediction modes
 enum { B_DC_PRED = 0,   // 4x4 modes
diff --git a/src/mux/Makefile.am b/src/mux/Makefile.am
index fa4a5cfe..6313cd60 100644
--- a/src/mux/Makefile.am
+++ b/src/mux/Makefile.am
@@ -13,6 +13,6 @@ libwebpmuxinclude_HEADERS += ../webp/mux_types.h
 libwebpmuxinclude_HEADERS += ../webp/types.h
 
 libwebpmux_la_LIBADD = ../libwebp.la
-libwebpmux_la_LDFLAGS = -no-undefined -version-info 0:1:0
+libwebpmux_la_LDFLAGS = -no-undefined -version-info 1:0:0
 libwebpmuxincludedir = $(includedir)/webp
 pkgconfig_DATA = libwebpmux.pc
diff --git a/src/mux/muxi.h b/src/mux/muxi.h
index 072fd061..277d5fba 100644
--- a/src/mux/muxi.h
+++ b/src/mux/muxi.h
@@ -27,8 +27,8 @@ extern "C" {
 // Defines and constants.
 
 #define MUX_MAJ_VERSION 0
-#define MUX_MIN_VERSION 1
-#define MUX_REV_VERSION 1
+#define MUX_MIN_VERSION 2
+#define MUX_REV_VERSION 0
 
 // Chunk object.
 typedef struct WebPChunk WebPChunk;