diff --git a/configure b/configure
index 3dbcc6960..5f56358b8 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.72 for ImageMagick 6.9.13-20.
+# Generated by GNU Autoconf 2.72 for ImageMagick 6.9.13-21.
 #
 # Report bugs to <https://github.com/ImageMagick/ImageMagick6/issues>.
 #
@@ -614,8 +614,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='ImageMagick'
 PACKAGE_TARNAME='ImageMagick'
-PACKAGE_VERSION='6.9.13-20'
-PACKAGE_STRING='ImageMagick 6.9.13-20'
+PACKAGE_VERSION='6.9.13-21'
+PACKAGE_STRING='ImageMagick 6.9.13-21'
 PACKAGE_BUGREPORT='https://github.com/ImageMagick/ImageMagick6/issues'
 PACKAGE_URL='https://legacy.imagemagick.org'
 
@@ -1886,7 +1886,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-'configure' configures ImageMagick 6.9.13-20 to adapt to many kinds of systems.
+'configure' configures ImageMagick 6.9.13-21 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1962,7 +1962,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of ImageMagick 6.9.13-20:";;
+     short | recursive ) echo "Configuration of ImageMagick 6.9.13-21:";;
    esac
   cat <<\_ACEOF
 
@@ -2268,7 +2268,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-ImageMagick configure 6.9.13-20
+ImageMagick configure 6.9.13-21
 generated by GNU Autoconf 2.72
 
 Copyright (C) 2023 Free Software Foundation, Inc.
@@ -3250,7 +3250,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by ImageMagick $as_me 6.9.13-20, which was
+It was created by ImageMagick $as_me 6.9.13-21, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -4892,7 +4892,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='ImageMagick'
- VERSION='6.9.13-20'
+ VERSION='6.9.13-21'
 
 
 # Some tools Automake needs.
@@ -5198,11 +5198,11 @@ MAGICK_MINOR_VERSION=9
 
 MAGICK_MICRO_VERSION=13
 
-MAGICK_PATCHLEVEL_VERSION=20
+MAGICK_PATCHLEVEL_VERSION=21
 
-MAGICK_VERSION=6.9.13-20
+MAGICK_VERSION=6.9.13-21
 
-MAGICK_GIT_REVISION=15ec380f5:20241221
+MAGICK_GIT_REVISION=8c57a5ac2:20241221
 
 
 # Substitute library versioning
@@ -5224,17 +5224,17 @@ MAGICKPP_LIBRARY_VERSION_INFO=$MAGICKPP_LIBRARY_CURRENT:$MAGICKPP_LIBRARY_REVISI
 
 PACKAGE_BASE_VERSION=6.9.13
 
-PACKAGE_PATCHLEVEL_VERSION=20
+PACKAGE_PATCHLEVEL_VERSION=21
 
-if test "n" = 'y'; then
-  PACKAGE_VERSION_ADDENDUM='-20 (Beta)'
+if test "y" = 'y'; then
+  PACKAGE_VERSION_ADDENDUM='-21 (Beta)'
 else
-  PACKAGE_VERSION_ADDENDUM=-20
+  PACKAGE_VERSION_ADDENDUM=-21
 fi
 
 PACKAGE_LIB_VERSION=0x69D
 
-PACKAGE_LIB_VERSION_NUMBER=6,9,13,20
+PACKAGE_LIB_VERSION_NUMBER=6,9,13,21
 
 PACKAGE_RELEASE_DATE=2024-12-21
 
@@ -39395,7 +39395,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by ImageMagick $as_me 6.9.13-20, which was
+This file was extended by ImageMagick $as_me 6.9.13-21, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -39464,7 +39464,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-ImageMagick config.status 6.9.13-20
+ImageMagick config.status 6.9.13-21
 configured by $0, generated by GNU Autoconf 2.72,
   with options \\"\$ac_cs_config\\"
 
diff --git a/m4/version.m4 b/m4/version.m4
index fc4dd62e7..09d3580df 100644
--- a/m4/version.m4
+++ b/m4/version.m4
@@ -27,8 +27,8 @@ m4_define([magick_name], [ImageMagick])
 m4_define([magick_major_version], [6])
 m4_define([magick_minor_version], [9])
 m4_define([magick_micro_version], [13])
-m4_define([magick_patchlevel_version], [20])
-m4_define([magick_is_beta], [n])
+m4_define([magick_patchlevel_version], [21])
+m4_define([magick_is_beta], [y])
 m4_define([magick_base_version],
           [magick_major_version.magick_minor_version.magick_micro_version])
 m4_define([magick_version],