diff --git a/libpng-1.6.22-apng.patch b/libpng-1.6.23-apng.patch
similarity index 95%
rename from libpng-1.6.22-apng.patch
rename to libpng-1.6.23-apng.patch
index b444ad1..74d0cad 100644
--- a/libpng-1.6.22-apng.patch
+++ b/libpng-1.6.23-apng.patch
@@ -1,6 +1,6 @@
-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
+diff -Naru libpng-1.6.23.org/png.h libpng-1.6.23/png.h
+--- libpng-1.6.23.org/png.h	2016-06-09 22:23:09.753041866 +0900
++++ libpng-1.6.23/png.h	2016-06-09 22:23:39.282106366 +0900
 @@ -366,6 +366,10 @@
  #   include "pnglibconf.h"
  #endif
@@ -139,9 +139,9 @@ diff -Naru libpng-1.6.22.org/png.h libpng-1.6.22/png.h
  #endif
  
  #ifdef __cplusplus
-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
+diff -Naru libpng-1.6.23.org/pngget.c libpng-1.6.23/pngget.c
+--- libpng-1.6.23.org/pngget.c	2016-06-09 22:21:54.199319849 +0900
++++ libpng-1.6.23/pngget.c	2016-06-09 22:23:39.230104491 +0900
 @@ -1216,4 +1216,166 @@
  #  endif
  #endif
@@ -309,9 +309,9 @@ diff -Naru libpng-1.6.22.org/pngget.c libpng-1.6.22/pngget.c
 +}
 +#endif /* PNG_APNG_SUPPORTED */
  #endif /* READ || WRITE */
-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
+diff -Naru libpng-1.6.23.org/pnginfo.h libpng-1.6.23/pnginfo.h
+--- libpng-1.6.23.org/pnginfo.h	2016-06-09 22:21:54.200319885 +0900
++++ libpng-1.6.23/pnginfo.h	2016-06-09 22:23:39.230104491 +0900
 @@ -255,5 +255,18 @@
     png_bytepp row_pointers;        /* the image bits */
  #endif
@@ -331,9 +331,9 @@ diff -Naru libpng-1.6.22.org/pnginfo.h libpng-1.6.22/pnginfo.h
 +
  };
  #endif /* PNGINFO_H */
-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
+diff -Naru libpng-1.6.23.org/pngpread.c libpng-1.6.23/pngpread.c
+--- libpng-1.6.23.org/pngpread.c	2016-06-09 22:23:09.754041902 +0900
++++ libpng-1.6.23/pngpread.c	2016-06-09 22:23:39.230104491 +0900
 @@ -194,6 +194,106 @@
  
     chunk_name = png_ptr->chunk_name;
@@ -441,7 +441,7 @@ diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
     if (chunk_name == png_IDAT)
     {
        if ((png_ptr->mode & PNG_AFTER_IDAT) != 0)
-@@ -258,6 +358,9 @@
+@@ -260,6 +360,9 @@
  
     else if (chunk_name == png_IDAT)
     {
@@ -451,7 +451,7 @@ diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
        png_ptr->idat_size = png_ptr->push_length;
        png_ptr->process_mode = PNG_READ_IDAT_MODE;
        png_push_have_info(png_ptr, info_ptr);
-@@ -403,6 +506,30 @@
+@@ -405,6 +508,30 @@
        png_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
     }
  #endif
@@ -482,7 +482,7 @@ diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
  
     else
     {
-@@ -533,7 +660,11 @@
+@@ -538,7 +665,11 @@
        png_byte chunk_tag[4];
  
        /* TODO: this code can be commoned up with the same code in push_read */
@@ -494,7 +494,7 @@ diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
        png_push_fill_buffer(png_ptr, chunk_length, 4);
        png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
        png_reset_crc(png_ptr);
-@@ -541,17 +672,64 @@
+@@ -546,17 +677,64 @@
        png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag);
        png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
  
@@ -559,7 +559,7 @@ diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
     }
  
     if (png_ptr->idat_size != 0 && png_ptr->save_buffer_size != 0)
-@@ -625,6 +803,15 @@
+@@ -630,6 +808,15 @@
     if (!(buffer_length > 0) || buffer == NULL)
        png_error(png_ptr, "No IDAT data (internal error)");
  
@@ -575,7 +575,7 @@ diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
     /* This routine must process all the data it has been given
      * before returning, calling the row callback as required to
      * handle the uncompressed results.
-@@ -1074,6 +1261,18 @@
+@@ -1079,6 +1266,18 @@
     png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
  }
  
@@ -594,9 +594,9 @@ diff -Naru libpng-1.6.22.org/pngpread.c libpng-1.6.22/pngpread.c
  png_voidp PNGAPI
  png_get_progressive_ptr(png_const_structrp png_ptr)
  {
-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
+diff -Naru libpng-1.6.23.org/pngpriv.h libpng-1.6.23/pngpriv.h
+--- libpng-1.6.23.org/pngpriv.h	2016-06-09 22:23:09.754041902 +0900
++++ libpng-1.6.23/pngpriv.h	2016-06-09 22:23:39.245105032 +0900
 @@ -537,6 +537,10 @@
  #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
                     /*             0x4000 (unused) */
@@ -673,10 +673,10 @@ diff -Naru libpng-1.6.22.org/pngpriv.h libpng-1.6.22/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-1.6.22.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 @@
+diff -Naru libpng-1.6.23.org/pngread.c libpng-1.6.23/pngread.c
+--- libpng-1.6.23.org/pngread.c	2016-06-09 22:23:09.755041938 +0900
++++ libpng-1.6.23/pngread.c	2016-06-09 22:23:39.247105104 +0900
+@@ -161,6 +161,9 @@
  
        else if (chunk_name == png_IDAT)
        {
@@ -686,7 +686,7 @@ diff -Naru libpng-1.6.22.org/pngread.c libpng-1.6.22/pngread.c
           png_ptr->idat_size = length;
           break;
        }
-@@ -247,6 +250,17 @@
+@@ -250,6 +253,17 @@
           png_handle_iTXt(png_ptr, info_ptr, length);
  #endif
  
@@ -704,7 +704,7 @@ diff -Naru libpng-1.6.22.org/pngread.c libpng-1.6.22/pngread.c
        else
           png_handle_unknown(png_ptr, info_ptr, length,
              PNG_HANDLE_CHUNK_AS_DEFAULT);
-@@ -254,6 +268,72 @@
+@@ -257,6 +271,72 @@
  }
  #endif /* SEQUENTIAL_READ */
  
@@ -777,9 +777,9 @@ diff -Naru libpng-1.6.22.org/pngread.c libpng-1.6.22/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-1.6.22.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
+diff -Naru libpng-1.6.23.org/pngrutil.c libpng-1.6.23/pngrutil.c
+--- libpng-1.6.23.org/pngrutil.c	2016-06-09 22:21:54.210320245 +0900
++++ libpng-1.6.23/pngrutil.c	2016-06-09 22:23:39.249105176 +0900
 @@ -855,6 +855,11 @@
     filter_type = buf[11];
     interlace_type = buf[12];
@@ -1111,9 +1111,9 @@ diff -Naru libpng-1.6.22.org/pngrutil.c libpng-1.6.22/pngrutil.c
 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 +#endif /* PNG_READ_APNG_SUPPORTED */
  #endif /* READ */
-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
+diff -Naru libpng-1.6.23.org/pngset.c libpng-1.6.23/pngset.c
+--- libpng-1.6.23.org/pngset.c	2016-06-09 22:23:09.756041974 +0900
++++ libpng-1.6.23/pngset.c	2016-06-09 22:23:39.249105176 +0900
 @@ -241,6 +241,11 @@
     info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
  
@@ -1126,7 +1126,7 @@ diff -Naru libpng-1.6.22.org/pngset.c libpng-1.6.22/pngset.c
  }
  
  #ifdef PNG_oFFs_SUPPORTED
-@@ -1094,6 +1099,147 @@
+@@ -1096,6 +1101,147 @@
  }
  #endif /* sPLT */
  
@@ -1274,9 +1274,9 @@ diff -Naru libpng-1.6.22.org/pngset.c libpng-1.6.22/pngset.c
  #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
  static png_byte
  check_location(png_const_structrp png_ptr, int location)
-diff -Naru libpng-1.6.22.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
+diff -Naru libpng-1.6.23.org/pngstruct.h libpng-1.6.23/pngstruct.h
+--- libpng-1.6.23.org/pngstruct.h	2016-06-09 22:21:54.210320245 +0900
++++ libpng-1.6.23/pngstruct.h	2016-06-09 22:23:39.250105212 +0900
 @@ -403,6 +403,27 @@
     png_byte filter_type;
  #endif
@@ -1305,9 +1305,9 @@ diff -Naru libpng-1.6.22.org/pngstruct.h libpng-1.6.22/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-1.6.22.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
+diff -Naru libpng-1.6.23.org/pngtest.c libpng-1.6.23/pngtest.c
+--- libpng-1.6.23.org/pngtest.c	2016-06-09 22:23:09.756041974 +0900
++++ libpng-1.6.23/pngtest.c	2016-06-09 22:23:39.250105212 +0900
 @@ -883,6 +883,10 @@
     volatile int num_passes;
     int pass;
@@ -1453,9 +1453,9 @@ diff -Naru libpng-1.6.22.org/pngtest.c libpng-1.6.22/pngtest.c
     for (pass = 0; pass < num_passes; pass++)
     {
  #     ifdef calc_pass_height
-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
+diff -Naru libpng-1.6.23.org/pngwrite.c libpng-1.6.23/pngwrite.c
+--- libpng-1.6.23.org/pngwrite.c	2016-06-09 22:21:54.212320317 +0900
++++ libpng-1.6.23/pngwrite.c	2016-06-09 22:23:39.251105248 +0900
 @@ -128,6 +128,10 @@
         * the application continues writing the PNG.  So check the 'invalid'
         * flag here too.
@@ -1523,9 +1523,9 @@ diff -Naru libpng-1.6.22.org/pngwrite.c libpng-1.6.22/pngwrite.c
  
  #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
  /* 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
+diff -Naru libpng-1.6.23.org/pngwutil.c libpng-1.6.23/pngwutil.c
+--- libpng-1.6.23.org/pngwutil.c	2016-06-09 22:21:54.213320353 +0900
++++ libpng-1.6.23/pngwutil.c	2016-06-09 22:23:39.251105248 +0900
 @@ -817,6 +817,11 @@
     /* Write the chunk */
     png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
@@ -1692,9 +1692,9 @@ diff -Naru libpng-1.6.22.org/pngwutil.c libpng-1.6.22/pngwutil.c
 +}
 +#endif /* PNG_WRITE_APNG_SUPPORTED */
  #endif /* WRITE */
-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
+diff -Naru libpng-1.6.23.org/scripts/symbols.def libpng-1.6.23/scripts/symbols.def
+--- libpng-1.6.23.org/scripts/symbols.def	2016-06-09 22:23:09.757042011 +0900
++++ libpng-1.6.23/scripts/symbols.def	2016-06-09 22:23:39.251105248 +0900
 @@ -250,3 +250,23 @@
   png_get_palette_max @243
   png_set_option @244
diff --git a/libpng.spec b/libpng.spec
index 89a5e29..7630954 100644
--- a/libpng.spec
+++ b/libpng.spec
@@ -1,6 +1,6 @@
 %define apiver %(echo %version | cut -d. -f1-2 | tr -d .)
 Name:          libpng
-Version:       1.6.22
+Version:       1.6.23
 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
+* Wed Jun 15 2016 Automatic Build System <autodist@mambasoft.it> 1.6.23-1mamba
+- automatic version update by autodist
+
 * Tue May 31 2016 Automatic Build System <autodist@mambasoft.it> 1.6.22-1mamba
 - automatic version update by autodist