diff --git a/libpng-1.6.21-apng.patch b/libpng-1.6.22-apng.patch
similarity index 91%
rename from libpng-1.6.21-apng.patch
rename to libpng-1.6.22-apng.patch
index c736853..b444ad1 100644
--- a/libpng-1.6.21-apng.patch
+++ b/libpng-1.6.22-apng.patch
@@ -1,7 +1,7 @@
-diff -Naru libpng-1.6.21.org/png.h libpng-1.6.21/png.h
---- libpng-1.6.21.org/png.h	2016-01-24 10:24:48.706471264 +0900
-+++ libpng-1.6.21/png.h	2016-01-24 10:23:01.113429997 +0900
-@@ -335,6 +335,10 @@
+diff -Naru libpng-1.6.22.org/png.h libpng-1.6.22/png.h
+--- libpng-1.6.22.org/png.h	2016-05-28 23:46:58.838127877 +0900
++++ libpng-1.6.22/png.h	2016-05-29 08:32:27.595634941 +0900
+@@ -366,6 +366,10 @@
  #   include "pnglibconf.h"
  #endif
  
@@ -12,7 +12,7 @@ diff -Naru libpng-1.6.21.org/png.h libpng-1.6.21/png.h
  #ifndef PNG_VERSION_INFO_ONLY
     /* Machine specific configuration. */
  #  include "pngconf.h"
-@@ -430,6 +434,17 @@
+@@ -461,6 +465,17 @@
   * See pngconf.h for base types that vary by machine/system
   */
  
@@ -30,18 +30,18 @@ diff -Naru libpng-1.6.21.org/png.h libpng-1.6.21/png.h
  /* This triggers a compiler error in png.c, if png.c and png.h
   * do not agree upon the version number.
   */
-@@ -751,6 +766,10 @@
- #define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
- #if INT_MAX >= 0x8000 /* else this might break */
- #define PNG_INFO_IDAT 0x8000   /* ESR, 1.0.6 */
+@@ -781,6 +796,10 @@
+ #define PNG_INFO_sPLT 0x2000U  /* ESR, 1.0.6 */
+ #define PNG_INFO_sCAL 0x4000U  /* ESR, 1.0.6 */
+ #define PNG_INFO_IDAT 0x8000U  /* ESR, 1.0.6 */
 +#ifdef PNG_APNG_SUPPORTED
 +#define PNG_INFO_acTL 0x10000
 +#define PNG_INFO_fcTL 0x20000
 +#endif
- #endif
  
  /* This is used for the transformation routines, as some of them
-@@ -789,6 +808,10 @@
+  * change these values for the row.  It also should enable using
+@@ -818,6 +837,10 @@
  #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
  typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
@@ -52,96 +52,96 @@ diff -Naru libpng-1.6.21.org/png.h libpng-1.6.21/png.h
  
  /* The following callback receives png_uint_32 row_number, int pass for the
   * png_bytep data of the row.  When transforming an interlaced image the
-@@ -3109,6 +3132,74 @@
+@@ -3236,6 +3259,74 @@
  /*******************************************************************************
   *  END OF HARDWARE AND SOFTWARE OPTIONS
   ******************************************************************************/
 +#ifdef PNG_APNG_SUPPORTED
-+PNG_EXPORT(245, png_uint_32, png_get_acTL, (png_structp png_ptr,
++PNG_EXPORT(246, png_uint_32, png_get_acTL, (png_structp png_ptr,
 +   png_infop info_ptr, png_uint_32 *num_frames, png_uint_32 *num_plays));
 +
-+PNG_EXPORT(246, png_uint_32, png_set_acTL, (png_structp png_ptr,
++PNG_EXPORT(247, png_uint_32, png_set_acTL, (png_structp png_ptr,
 +   png_infop info_ptr, png_uint_32 num_frames, png_uint_32 num_plays));
 +
-+PNG_EXPORT(247, png_uint_32, png_get_num_frames, (png_structp png_ptr,
++PNG_EXPORT(248, png_uint_32, png_get_num_frames, (png_structp png_ptr,
 +   png_infop info_ptr));
 +
-+PNG_EXPORT(248, png_uint_32, png_get_num_plays, (png_structp png_ptr,
++PNG_EXPORT(249, png_uint_32, png_get_num_plays, (png_structp png_ptr,
 +   png_infop info_ptr));
 +
-+PNG_EXPORT(249, png_uint_32, png_get_next_frame_fcTL,
++PNG_EXPORT(250, png_uint_32, png_get_next_frame_fcTL,
 +   (png_structp png_ptr, png_infop info_ptr, png_uint_32 *width,
 +   png_uint_32 *height, png_uint_32 *x_offset, png_uint_32 *y_offset,
 +   png_uint_16 *delay_num, png_uint_16 *delay_den, png_byte *dispose_op,
 +   png_byte *blend_op));
 +
-+PNG_EXPORT(250, png_uint_32, png_set_next_frame_fcTL,
++PNG_EXPORT(251, png_uint_32, png_set_next_frame_fcTL,
 +   (png_structp png_ptr, png_infop info_ptr, png_uint_32 width,
 +   png_uint_32 height, png_uint_32 x_offset, png_uint_32 y_offset,
 +   png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
 +   png_byte blend_op));
 +
-+PNG_EXPORT(251, png_uint_32, png_get_next_frame_width,
++PNG_EXPORT(252, png_uint_32, png_get_next_frame_width,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(252, png_uint_32, png_get_next_frame_height,
++PNG_EXPORT(253, png_uint_32, png_get_next_frame_height,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(253, png_uint_32, png_get_next_frame_x_offset,
++PNG_EXPORT(254, png_uint_32, png_get_next_frame_x_offset,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(254, png_uint_32, png_get_next_frame_y_offset,
++PNG_EXPORT(255, png_uint_32, png_get_next_frame_y_offset,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(255, png_uint_16, png_get_next_frame_delay_num,
++PNG_EXPORT(256, png_uint_16, png_get_next_frame_delay_num,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(256, png_uint_16, png_get_next_frame_delay_den,
++PNG_EXPORT(257, png_uint_16, png_get_next_frame_delay_den,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(257, png_byte, png_get_next_frame_dispose_op,
++PNG_EXPORT(258, png_byte, png_get_next_frame_dispose_op,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(258, png_byte, png_get_next_frame_blend_op,
++PNG_EXPORT(259, png_byte, png_get_next_frame_blend_op,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(259, png_byte, png_get_first_frame_is_hidden,
++PNG_EXPORT(260, png_byte, png_get_first_frame_is_hidden,
 +   (png_structp png_ptr, png_infop info_ptr));
-+PNG_EXPORT(260, png_uint_32, png_set_first_frame_is_hidden,
++PNG_EXPORT(261, png_uint_32, png_set_first_frame_is_hidden,
 +   (png_structp png_ptr, png_infop info_ptr, png_byte is_hidden));
 +
 +#ifdef PNG_READ_APNG_SUPPORTED
-+PNG_EXPORT(261, void, png_read_frame_head, (png_structp png_ptr,
++PNG_EXPORT(262, void, png_read_frame_head, (png_structp png_ptr,
 +   png_infop info_ptr));
 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-+PNG_EXPORT(262, void, png_set_progressive_frame_fn, (png_structp png_ptr,
++PNG_EXPORT(263, void, png_set_progressive_frame_fn, (png_structp png_ptr,
 +   png_progressive_frame_ptr frame_info_fn,
 +   png_progressive_frame_ptr frame_end_fn));
 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 +#endif /* PNG_READ_APNG_SUPPORTED */
 +
 +#ifdef PNG_WRITE_APNG_SUPPORTED
-+PNG_EXPORT(263, void, png_write_frame_head, (png_structp png_ptr,
++PNG_EXPORT(264, void, png_write_frame_head, (png_structp png_ptr,
 +   png_infop info_ptr, png_bytepp row_pointers,
 +   png_uint_32 width, png_uint_32 height,
 +   png_uint_32 x_offset, png_uint_32 y_offset,
 +   png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
 +   png_byte blend_op));
 +
-+PNG_EXPORT(264, void, png_write_frame_tail, (png_structp png_ptr,
++PNG_EXPORT(265, void, png_write_frame_tail, (png_structp png_ptr,
 +   png_infop info_ptr));
 +#endif /* PNG_WRITE_APNG_SUPPORTED */
 +#endif /* PNG_APNG_SUPPORTED */
  
  /* Maintainer: Put new public prototypes here ^, in libpng.3, in project
   * defs, and in scripts/symbols.def.
-@@ -3118,7 +3209,11 @@
+@@ -3245,7 +3336,11 @@
   * one to use is one more than this.)
   */
  #ifdef PNG_EXPORT_LAST_ORDINAL
 +#ifdef PNG_APNG_SUPPORTED
-+  PNG_EXPORT_LAST_ORDINAL(264);
++  PNG_EXPORT_LAST_ORDINAL(265);
 +#else
-   PNG_EXPORT_LAST_ORDINAL(244);
+   PNG_EXPORT_LAST_ORDINAL(245);
 +#endif /* PNG_APNG_SUPPORTED */
  #endif
  
  #ifdef __cplusplus
-diff -Naru libpng-1.6.21.org/pngget.c libpng-1.6.21/pngget.c
---- libpng-1.6.21.org/pngget.c	2016-01-24 10:20:33.756887423 +0900
-+++ libpng-1.6.21/pngget.c	2016-01-24 10:23:01.115430072 +0900
+diff -Naru libpng-1.6.22.org/pngget.c libpng-1.6.22/pngget.c
+--- libpng-1.6.22.org/pngget.c	2016-05-28 23:46:45.201640861 +0900
++++ libpng-1.6.22/pngget.c	2016-05-29 08:32:27.595634941 +0900
 @@ -1216,4 +1216,166 @@
  #  endif
  #endif
@@ -309,9 +309,9 @@ diff -Naru libpng-1.6.21.org/pngget.c libpng-1.6.21/pngget.c
 +}
 +#endif /* PNG_APNG_SUPPORTED */
  #endif /* READ || WRITE */
-diff -Naru libpng-1.6.21.org/pnginfo.h libpng-1.6.21/pnginfo.h
---- libpng-1.6.21.org/pnginfo.h	2016-01-24 10:20:33.756887423 +0900
-+++ libpng-1.6.21/pnginfo.h	2016-01-24 10:23:01.116430110 +0900
+diff -Naru libpng-1.6.22.org/pnginfo.h libpng-1.6.22/pnginfo.h
+--- libpng-1.6.22.org/pnginfo.h	2016-05-28 23:46:43.159567939 +0900
++++ libpng-1.6.22/pnginfo.h	2016-05-29 08:32:27.595634941 +0900
 @@ -255,5 +255,18 @@
     png_bytepp row_pointers;        /* the image bits */
  #endif
@@ -331,9 +331,9 @@ diff -Naru libpng-1.6.21.org/pnginfo.h libpng-1.6.21/pnginfo.h
 +
  };
  #endif /* PNGINFO_H */
-diff -Naru libpng-1.6.21.org/pngpread.c libpng-1.6.21/pngpread.c
---- libpng-1.6.21.org/pngpread.c	2016-01-24 10:20:33.756887423 +0900
-+++ libpng-1.6.21/pngpread.c	2016-01-24 10:23:01.116430110 +0900
+diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
+--- libpng-1.6.22.org/pngpread.c	2016-05-28 23:46:43.159567939 +0900
++++ libpng-1.6.22/pngpread.c	2016-05-29 08:32:27.596634977 +0900
 @@ -194,6 +194,106 @@
  
     chunk_name = png_ptr->chunk_name;
@@ -594,9 +594,9 @@ diff -Naru libpng-1.6.21.org/pngpread.c libpng-1.6.21/pngpread.c
  png_voidp PNGAPI
  png_get_progressive_ptr(png_const_structrp png_ptr)
  {
-diff -Naru libpng-1.6.21.org/pngpriv.h libpng-1.6.21/pngpriv.h
---- libpng-1.6.21.org/pngpriv.h	2016-01-24 10:24:48.707471302 +0900
-+++ libpng-1.6.21/pngpriv.h	2016-01-24 10:23:01.117430148 +0900
+diff -Naru libpng-1.6.22.org/pngpriv.h libpng-1.6.22/pngpriv.h
+--- libpng-1.6.22.org/pngpriv.h	2016-05-28 23:46:45.202640897 +0900
++++ libpng-1.6.22/pngpriv.h	2016-05-29 08:32:27.597635012 +0900
 @@ -537,6 +537,10 @@
  #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
                     /*             0x4000 (unused) */
@@ -673,9 +673,9 @@ diff -Naru libpng-1.6.21.org/pngpriv.h libpng-1.6.21/pngpriv.h
  /* Added at libpng version 1.4.0 */
  #ifdef PNG_COLORSPACE_SUPPORTED
  /* These internal functions are for maintaining the colorspace structure within
-diff -Naru libpng-1.6.21.org/pngread.c libpng-1.6.21/pngread.c
---- libpng-1.6.21.org/pngread.c	2016-01-24 10:20:33.757887461 +0900
-+++ libpng-1.6.21/pngread.c	2016-01-24 10:23:01.118430185 +0900
+diff -Naru libpng-1.6.22.org/pngread.c libpng-1.6.22/pngread.c
+--- libpng-1.6.22.org/pngread.c	2016-05-28 23:46:45.203640933 +0900
++++ libpng-1.6.22/pngread.c	2016-05-29 08:32:27.598635048 +0900
 @@ -158,6 +158,9 @@
  
        else if (chunk_name == png_IDAT)
@@ -777,9 +777,9 @@ diff -Naru libpng-1.6.21.org/pngread.c libpng-1.6.21/pngread.c
  /* Optional call to update the users info_ptr structure */
  void PNGAPI
  png_read_update_info(png_structrp png_ptr, png_inforp info_ptr)
-diff -Naru libpng-1.6.21.org/pngrutil.c libpng-1.6.21/pngrutil.c
---- libpng-1.6.21.org/pngrutil.c	2016-01-24 10:24:48.708471339 +0900
-+++ libpng-1.6.21/pngrutil.c	2016-01-24 10:23:01.120430260 +0900
+diff -Naru libpng-1.6.22.org/pngrutil.c libpng-1.6.22/pngrutil.c
+--- libpng-1.6.22.org/pngrutil.c	2016-05-28 23:46:45.205641004 +0900
++++ libpng-1.6.22/pngrutil.c	2016-05-29 08:32:27.599635084 +0900
 @@ -855,6 +855,11 @@
     filter_type = buf[11];
     interlace_type = buf[12];
@@ -1111,9 +1111,9 @@ diff -Naru libpng-1.6.21.org/pngrutil.c libpng-1.6.21/pngrutil.c
 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 +#endif /* PNG_READ_APNG_SUPPORTED */
  #endif /* READ */
-diff -Naru libpng-1.6.21.org/pngset.c libpng-1.6.21/pngset.c
---- libpng-1.6.21.org/pngset.c	2016-01-24 10:24:48.708471339 +0900
-+++ libpng-1.6.21/pngset.c	2016-01-24 10:23:01.123430373 +0900
+diff -Naru libpng-1.6.22.org/pngset.c libpng-1.6.22/pngset.c
+--- libpng-1.6.22.org/pngset.c	2016-05-28 23:46:58.839127913 +0900
++++ libpng-1.6.22/pngset.c	2016-05-29 08:32:27.600635119 +0900
 @@ -241,6 +241,11 @@
     info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
  
@@ -1274,9 +1274,9 @@ diff -Naru libpng-1.6.21.org/pngset.c libpng-1.6.21/pngset.c
  #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
  static png_byte
  check_location(png_const_structrp png_ptr, int location)
-diff -Naru libpng-1.6.21.org/pngstruct.h libpng-1.6.21/pngstruct.h
---- libpng-1.6.21.org/pngstruct.h	2016-01-24 10:20:33.760887574 +0900
-+++ libpng-1.6.21/pngstruct.h	2016-01-24 10:23:01.124430411 +0900
+diff -Naru libpng-1.6.22.org/pngstruct.h libpng-1.6.22/pngstruct.h
+--- libpng-1.6.22.org/pngstruct.h	2016-05-28 23:46:43.164568117 +0900
++++ libpng-1.6.22/pngstruct.h	2016-05-29 08:32:27.600635119 +0900
 @@ -403,6 +403,27 @@
     png_byte filter_type;
  #endif
@@ -1305,10 +1305,10 @@ diff -Naru libpng-1.6.21.org/pngstruct.h libpng-1.6.21/pngstruct.h
  /* New members added in libpng-1.2.0 */
  
  /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
-diff -Naru libpng-1.6.21.org/pngtest.c libpng-1.6.21/pngtest.c
---- libpng-1.6.21.org/pngtest.c	2016-01-24 10:24:48.709471377 +0900
-+++ libpng-1.6.21/pngtest.c	2016-01-24 10:23:01.406441009 +0900
-@@ -874,6 +874,10 @@
+diff -Naru libpng-1.6.22.org/pngtest.c libpng-1.6.22/pngtest.c
+--- libpng-1.6.22.org/pngtest.c	2016-05-28 23:46:58.839127913 +0900
++++ libpng-1.6.22/pngtest.c	2016-05-29 08:32:27.601635155 +0900
+@@ -883,6 +883,10 @@
     volatile int num_passes;
     int pass;
     int bit_depth, color_type;
@@ -1319,7 +1319,7 @@ diff -Naru libpng-1.6.21.org/pngtest.c libpng-1.6.21/pngtest.c
  
     row_buf = NULL;
     error_parameters.file_name = inname;
-@@ -1347,6 +1351,22 @@
+@@ -1356,6 +1360,22 @@
        }
     }
  #endif
@@ -1342,7 +1342,7 @@ diff -Naru libpng-1.6.21.org/pngtest.c libpng-1.6.21/pngtest.c
  #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
     {
        png_unknown_chunkp unknowns;
-@@ -1418,6 +1438,110 @@
+@@ -1427,6 +1447,110 @@
     t_misc += (t_stop - t_start);
     t_start = t_stop;
  #endif
@@ -1453,9 +1453,9 @@ diff -Naru libpng-1.6.21.org/pngtest.c libpng-1.6.21/pngtest.c
     for (pass = 0; pass < num_passes; pass++)
     {
  #     ifdef calc_pass_height
-diff -Naru libpng-1.6.21.org/pngwrite.c libpng-1.6.21/pngwrite.c
---- libpng-1.6.21.org/pngwrite.c	2016-01-24 10:20:33.761887612 +0900
-+++ libpng-1.6.21/pngwrite.c	2016-01-24 10:23:01.408441084 +0900
+diff -Naru libpng-1.6.22.org/pngwrite.c libpng-1.6.22/pngwrite.c
+--- libpng-1.6.22.org/pngwrite.c	2016-05-28 23:46:45.206641040 +0900
++++ libpng-1.6.22/pngwrite.c	2016-05-29 08:32:27.602635191 +0900
 @@ -128,6 +128,10 @@
         * the application continues writing the PNG.  So check the 'invalid'
         * flag here too.
@@ -1522,10 +1522,10 @@ diff -Naru libpng-1.6.21.org/pngwrite.c libpng-1.6.21/pngwrite.c
 +#endif /* PNG_WRITE_APNG_SUPPORTED */
  
  #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
- # ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */
-diff -Naru libpng-1.6.21.org/pngwutil.c libpng-1.6.21/pngwutil.c
---- libpng-1.6.21.org/pngwutil.c	2016-01-24 10:24:48.711471452 +0900
-+++ libpng-1.6.21/pngwutil.c	2016-01-24 10:23:01.410441159 +0900
+ /* Initialize the write structure - general purpose utility. */
+diff -Naru libpng-1.6.22.org/pngwutil.c libpng-1.6.22/pngwutil.c
+--- libpng-1.6.22.org/pngwutil.c	2016-05-28 23:46:45.207641076 +0900
++++ libpng-1.6.22/pngwutil.c	2016-05-29 08:32:27.603635226 +0900
 @@ -817,6 +817,11 @@
     /* Write the chunk */
     png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
@@ -1692,30 +1692,30 @@ diff -Naru libpng-1.6.21.org/pngwutil.c libpng-1.6.21/pngwutil.c
 +}
 +#endif /* PNG_WRITE_APNG_SUPPORTED */
  #endif /* WRITE */
-diff -Naru libpng-1.6.21.org/scripts/symbols.def libpng-1.6.21/scripts/symbols.def
---- libpng-1.6.21.org/scripts/symbols.def	2016-01-24 10:24:48.712471489 +0900
-+++ libpng-1.6.21/scripts/symbols.def	2016-01-24 10:23:01.412441235 +0900
-@@ -249,3 +249,23 @@
-  png_set_check_for_invalid_index @242
+diff -Naru libpng-1.6.22.org/scripts/symbols.def libpng-1.6.22/scripts/symbols.def
+--- libpng-1.6.22.org/scripts/symbols.def	2016-05-28 23:46:58.841127984 +0900
++++ libpng-1.6.22/scripts/symbols.def	2016-05-29 08:32:27.603635226 +0900
+@@ -250,3 +250,23 @@
   png_get_palette_max @243
   png_set_option @244
-+ png_get_acTL @245
-+ png_set_acTL @246
-+ png_get_num_frames @247
-+ png_get_num_plays @248
-+ png_get_next_frame_fcTL @249
-+ png_set_next_frame_fcTL @250
-+ png_get_next_frame_width @251
-+ png_get_next_frame_height @252
-+ png_get_next_frame_x_offset @253
-+ png_get_next_frame_y_offset @254
-+ png_get_next_frame_delay_num @255
-+ png_get_next_frame_delay_den @256
-+ png_get_next_frame_dispose_op @257
-+ png_get_next_frame_blend_op @258
-+ png_get_first_frame_is_hidden @259
-+ png_set_first_frame_is_hidden @260
-+ png_read_frame_head @261
-+ png_set_progressive_frame_fn @262
-+ png_write_frame_head @263
-+ png_write_frame_tail @264
+  png_image_write_to_memory @245
++ png_get_acTL @246
++ png_set_acTL @247
++ png_get_num_frames @248
++ png_get_num_plays @249
++ png_get_next_frame_fcTL @250
++ png_set_next_frame_fcTL @251
++ png_get_next_frame_width @252
++ png_get_next_frame_height @253
++ png_get_next_frame_x_offset @254
++ png_get_next_frame_y_offset @255
++ png_get_next_frame_delay_num @256
++ png_get_next_frame_delay_den @257
++ png_get_next_frame_dispose_op @258
++ png_get_next_frame_blend_op @259
++ png_get_first_frame_is_hidden @260
++ png_set_first_frame_is_hidden @261
++ png_read_frame_head @262
++ png_set_progressive_frame_fn @263
++ png_write_frame_head @264
++ png_write_frame_tail @265
diff --git a/libpng.spec b/libpng.spec
index 8b99429..89a5e29 100644
--- a/libpng.spec
+++ b/libpng.spec
@@ -1,6 +1,6 @@
 %define apiver %(echo %version | cut -d. -f1-2 | tr -d .)
 Name:          libpng
-Version:       1.6.21
+Version:       1.6.22
 Release:       1mamba
 Summary:       A library of functions for manipulating PNG image format files
 Group:         System/Libraries
@@ -125,6 +125,9 @@ ln -s libpng%{apiver}.so %{buildroot}%{_prefix}/lib/libpng.so
 %endif
 
 %changelog
+* Tue May 31 2016 Automatic Build System <autodist@mambasoft.it> 1.6.22-1mamba
+- automatic version update by autodist
+
 * Mon Jan 25 2016 Automatic Build System <autodist@mambasoft.it> 1.6.21-1mamba
 - automatic version update by autodist