diff --git a/LICENSE b/LICENSE
index 2fff8f2f7..d9ff34693 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.0.7, July 1, 2000, through 1.5.24beta01, July 24, 2015, are
+libpng versions 1.0.7, July 1, 2000, through 1.5.24beta01, August 19, 2015, are
 Copyright (c) 2000-2002, 2004, 2006-2015 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.0.6
 with the following individuals added to the list of Contributing Authors:
@@ -103,4 +103,4 @@ the additional disclaimers inserted at version 1.0.7.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-July 24, 2015
+August 19, 2015
diff --git a/README b/README
index 4477653bd..b31b5e260 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.5.24beta01 - July 24, 2015 (shared library 15.0)
+README for libpng version 1.5.24beta01 - August 19, 2015 (shared library 15.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
diff --git a/libpngpf.3 b/libpngpf.3
index 7993c91ca..29b4107a7 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,4 +1,4 @@
-.TH LIBPNGPF 3 "July 24, 2015"
+.TH LIBPNGPF 3 "August 19, 2015"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.5.24beta01
 (private functions)
diff --git a/png.5 b/png.5
index 61733f582..9f4307ba5 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "August 11, 2015"
+.TH PNG 5 "August 19, 2015"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/pngconf.h b/pngconf.h
index a7560a430..33120e285 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.5.24beta01, July 24, 2015
+ * libpng version 1.5.24beta01, August 19, 2015
  *
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngpriv.h b/pngpriv.h
index a1cb3fff4..888417abb 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -517,10 +517,6 @@
 #define PNG_STRUCT_PNG   0x0001
 #define PNG_STRUCT_INFO  0x0002
 
-/* Scaling factor for filter heuristic weighting calculations */
-#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
-#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
-
 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
diff --git a/projects/vstudio/readme.txt b/projects/vstudio/readme.txt
index 66a48f450..56140ba0c 100644
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.5.24beta01 - July 24, 2015
+libpng version 1.5.24beta01 - August 19, 2015
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 
diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props
index cc085841a..6c63936f9 100644
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.5.24beta01 - July 24, 2015
+ * libpng version 1.5.24beta01 - August 19, 2015
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
diff --git a/scripts/README.txt b/scripts/README.txt
index a9596d39c..7c3afe96f 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,5 +1,5 @@
 
-Makefiles for  libpng version 1.5.24beta01 - July 24, 2015
+Makefiles for  libpng version 1.5.24beta01 - August 19, 2015
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
diff --git a/scripts/pnglibconf.dfa b/scripts/pnglibconf.dfa
index a0d9d4ee3..9f28a2897 100644
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -409,9 +409,7 @@ option WRITE_USER_TRANSFORM requires WRITE_TRANSFORMS
 
 option WRITE_INTERLACING requires WRITE
 
-# The following depends, internally, on WEIGHT_SHIFT and COST_SHIFT
-# where are set below.
-
+# Deprecated, will be removed.
 option WRITE_WEIGHTED_FILTER requires WRITE
 
 option WRITE_FLUSH requires WRITE
@@ -511,11 +509,6 @@ setting MAX_GAMMA_8 default 11
 
 setting GAMMA_THRESHOLD_FIXED default 5000
 
-# Scaling factor for filter heuristic weighting calculations
-
-setting WEIGHT_SHIFT default 8
-setting COST_SHIFT default 3
-
 # Precision to use when converting a floating point value to a PNG
 # extension format string in an sCAL chunk (only relevant if the
 # floating point API is enabled)
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index 1feafe08a..c39c2104e 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -1,7 +1,7 @@
 /* 1.5.24beta01 STANDARD API DEFINITION */
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.5.24beta01 - July 24, 2015 */
+/* libpng version 1.5.24beta01 - August 19, 2015 */
 
 /* Copyright (c) 1998-2013 Glenn Randers-Pehrson */
 
@@ -171,7 +171,6 @@
 /* end of options */
 /* settings */
 #define PNG_API_RULE 0
-#define PNG_COST_SHIFT 3
 #define PNG_DEFAULT_READ_MACROS 1
 #define PNG_GAMMA_THRESHOLD_FIXED 5000
 #define PNG_MAX_GAMMA_8 11
@@ -182,7 +181,6 @@
 #define PNG_USER_CHUNK_MALLOC_MAX 8000000
 #define PNG_USER_HEIGHT_MAX 1000000
 #define PNG_USER_WIDTH_MAX 1000000
-#define PNG_WEIGHT_SHIFT 8
 #define PNG_ZBUF_SIZE 8192
 #define PNG_sCAL_PRECISION 5
 /* end of settings */