diff --git a/doc/APIchanges b/doc/APIchanges
index 425a337128..fe02eb2c0b 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,7 +13,10 @@ libavutil:   2011-04-18
 
 API changes, most recent first:
 
-2011-09-xx - xxxxxxx - lavfi 2.x.0
+2011-09-12 - xxxxxxx - lavfi 2.40.0
+  Change AVFilterBufferRefAudioProps.sample_rate type from uint32_t to int.
+
+2011-09-12 - xxxxxxx - lavfi 2.40.0
   Simplify signature for avfilter_get_audio_buffer(), make it
   consistent with avfilter_get_video_buffer().
 
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index f92035ff7b..90bb4d17fb 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -29,7 +29,7 @@
 #include "libavutil/rational.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR 39
+#define LIBAVFILTER_VERSION_MINOR 40
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \