diff --git a/doc/APIchanges b/doc/APIchanges
index caa05d13b8..5135464729 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,9 @@ libavutil:     2014-08-09
 
 API changes, most recent first:
 
+201x-xx-xx - xxxxxxx - lavc 56.9.0 - avcodec.h
+  Add AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH flag to av_vdpau_bind_context().
+
 201x-xx-xx - xxxxxxx - lavc 56.8.0 - avcodec.h
   Add AVCodecContext.sw_pix_fmt.
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 527824601e..99467bb069 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -3403,6 +3403,12 @@ typedef struct AVHWAccel {
  */
 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
 
+/**
+ * Hardware acceleration can output YUV pixel formats with a different chroma
+ * sampling than 4:2:0 and/or other than 8 bits per component.
+ */
+#define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
+
 /**
  * @}
  */
diff --git a/libavcodec/version.h b/libavcodec/version.h
index d85a2542c7..7e33da02d9 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -29,7 +29,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 56
-#define LIBAVCODEC_VERSION_MINOR  17
+#define LIBAVCODEC_VERSION_MINOR  18
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \