diff --git a/.github/workflows/build_macos.yml b/.github/workflows/build_macos.yml
new file mode 100644
index 0000000..c0d808d
--- /dev/null
+++ b/.github/workflows/build_macos.yml
@@ -0,0 +1,37 @@
+# Build from source.
+name: build_macos
+on: [push, pull_request]
+permissions: read-all
+jobs:
+  build_ubuntu:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+        - os: macos-12
+          configure_options: ''
+        - os: macos-13
+          configure_options: ''
+        - os: macos-14
+          configure_options: ''
+        - os: macos-15
+          configure_options: ''
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install build dependencies
+      run: |
+        brew update -q
+        brew install -q autoconf automake gettext gnu-sed libtool pkg-config || true
+        brew link --force gettext
+        ln -s /usr/local/bin/glibtoolize /usr/local/bin/libtoolize
+    - name: Download test data
+      run: |
+        if test -x "synctestdata.sh"; then ./synctestdata.sh; fi
+    - name: Building from source
+      env:
+        CC: ${{ matrix.compiler }}
+      run: |
+        tests/build.sh ${{ matrix.configure_options }}
+    - name: Run tests
+      run: |
+        tests/runtests.sh
diff --git a/.github/workflows/build_wheel.yml b/.github/workflows/build_wheel.yml
index d98d681..d2937bd 100644
--- a/.github/workflows/build_wheel.yml
+++ b/.github/workflows/build_wheel.yml
@@ -8,8 +8,6 @@ jobs:
     strategy:
       matrix:
         include:
-        - python-version: '3.7'
-          toxenv: 'py37'
         - python-version: '3.8'
           toxenv: 'py38'
         - python-version: '3.9'
@@ -20,6 +18,8 @@ jobs:
           toxenv: 'py311'
         - python-version: '3.12'
           toxenv: 'py312'
+        - python-version: '3.13'
+          toxenv: 'py313'
     steps:
     - uses: actions/checkout@v4
     - name: Install build dependencies
diff --git a/appveyor.yml b/appveyor.yml
index 5f0b043..6288332 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -81,7 +81,7 @@ environment:
     PYTHON_PATH: "C:\\Python311-x64"
   - TARGET: macos-x64-clang
     BUILD_ENVIRONMENT: xcode
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     HOMEBREW_NO_INSTALL_CLEANUP: 1
     CC: clang
     CFLAGS: "-I/usr/local/include"
@@ -89,7 +89,7 @@ environment:
     CONFIGURE_OPTIONS: ""
   - TARGET: macos-x64-gcc
     BUILD_ENVIRONMENT: xcode
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     HOMEBREW_NO_INSTALL_CLEANUP: 1
     CC: gcc
     CFLAGS: "-I/usr/local/include"
@@ -97,7 +97,7 @@ environment:
     CONFIGURE_OPTIONS: ""
   - TARGET: macos-x64-gcc-python
     BUILD_ENVIRONMENT: xcode
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     PYTHON: "/usr/local/opt/python@3.11/bin/python3"
     PYTHON_CONFIG: "/usr/local/opt/python@3.11/bin/python3-config"
     HOMEBREW_NO_INSTALL_CLEANUP: 1
@@ -107,7 +107,7 @@ environment:
     CONFIGURE_OPTIONS: "--enable-python"
   - TARGET: macos-pkgbuild
     BUILD_ENVIRONMENT: xcode
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     PYTHON: "/usr/local/opt/python@3.11/bin/python3"
     PYTHON_CONFIG: "/usr/local/opt/python@3.11/bin/python3-config"
     HOMEBREW_NO_INSTALL_CLEANUP: 1
@@ -175,36 +175,48 @@ environment:
     PYTHON: "C:\\Python312-x64\\python.exe"
     PYTHON_VERSION: 3.12
     TOXENV: py312
-  - TARGET: macos-tox-py38
+  - TARGET: windows-tox-py313-32bit
     BUILD_ENVIRONMENT: python-tox
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
-    HOMEBREW_NO_INSTALL_CLEANUP: 1
-    PYTHON_VERSION: 3.8
-    TOXENV: py38
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
+    PYTHON: "C:\\Python313\\python.exe"
+    PYTHON_VERSION: 3.13
+    TOXENV: py313
+  - TARGET: windows-tox-py313-64bit
+    BUILD_ENVIRONMENT: python-tox
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
+    PYTHON: "C:\\Python313-x64\\python.exe"
+    PYTHON_VERSION: 3.13
+    TOXENV: py313
   - TARGET: macos-tox-py39
     BUILD_ENVIRONMENT: python-tox
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     HOMEBREW_NO_INSTALL_CLEANUP: 1
     PYTHON_VERSION: 3.9
     TOXENV: py39
   - TARGET: macos-tox-py310
     BUILD_ENVIRONMENT: python-tox
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     HOMEBREW_NO_INSTALL_CLEANUP: 1
     PYTHON_VERSION: 3.10
     TOXENV: py310
   - TARGET: macos-tox-py311
     BUILD_ENVIRONMENT: python-tox
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     HOMEBREW_NO_INSTALL_CLEANUP: 1
     PYTHON_VERSION: 3.11
     TOXENV: py311
   - TARGET: macos-tox-py312
     BUILD_ENVIRONMENT: python-tox
-    APPVEYOR_BUILD_WORKER_IMAGE: macos-monterey
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
     HOMEBREW_NO_INSTALL_CLEANUP: 1
     PYTHON_VERSION: 3.12
     TOXENV: py312
+  - TARGET: macos-tox-py313
+    BUILD_ENVIRONMENT: python-tox
+    APPVEYOR_BUILD_WORKER_IMAGE: macos-sonoma
+    HOMEBREW_NO_INSTALL_CLEANUP: 1
+    PYTHON_VERSION: 3.13
+    TOXENV: py313
   - TARGET: linux-tox-py310
     BUILD_ENVIRONMENT: python-tox
     APPVEYOR_BUILD_WORKER_IMAGE: ubuntu2204
diff --git a/autogen.ps1 b/autogen.ps1
index fd3f68b..f39c5f1 100644
--- a/autogen.ps1
+++ b/autogen.ps1
@@ -1,12 +1,12 @@
 # Script to generate the necessary files for a msvscpp build
 #
-# Version: 20240306
+# Version: 20241014
 
 $WinFlex = "..\win_flex_bison\win_flex.exe"
 $WinBison = "..\win_flex_bison\win_bison.exe"
 
-$Library = Get-Content -Path configure.ac | select -skip 3 -first 1 | % { $_ -Replace " \[","" } | % { $_ -Replace "\],","" }
-$Version = Get-Content -Path configure.ac | select -skip 4 -first 1 | % { $_ -Replace " \[","" } | % { $_ -Replace "\],","" }
+$Library = Get-Content -Path configure.ac | select -skip 3 -first 1 | % { $_ -Replace "  \[","" } | % { $_ -Replace "\],","" }
+$Version = Get-Content -Path configure.ac | select -skip 4 -first 1 | % { $_ -Replace "  \[","" } | % { $_ -Replace "\],","" }
 $Prefix = ${Library}.Substring(3)
 
 Get-Content -Path "include\${Library}.h.in" | Out-File -Encoding ascii "include\${Library}.h"
diff --git a/autogen.sh b/autogen.sh
index 83f54ea..bd307d2 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,32 +1,38 @@
 #!/bin/sh
-# Script to generate ./configure using the autotools
+# Script to generate configure and Makefile using the autotools.
 #
-# Version: 20230405
+# Version: 20241013
 
 EXIT_SUCCESS=0;
 EXIT_FAILURE=1;
 
-BINDIR="/usr/bin";
+BINDIR=`which aclocal`;
+BINDIR=`dirname ${BINDIR}`;
 
-if ! test -x "${BINDIR}/aclocal";
+if ! test -x "${BINDIR}/aclocal" && test "${BINDIR}" != "/usr/bin";
 then
-	BINDIR="/usr/local/bin";
+	BINDIR="/usr/bin";
 fi
-if ! test -x "${BINDIR}/aclocal";
+if ! test -x "${BINDIR}/aclocal" && test "${BINDIR}" != "/usr/local/bin";
 then
 	BINDIR="/usr/local/bin";
 fi
-if ! test -x "${BINDIR}/aclocal";
+if ! test -x "${BINDIR}/aclocal" && test "${BINDIR}" != "/opt/local/bin";
 then
 	# Default location of MacPorts installed binaries.
 	BINDIR="/opt/local/bin";
 fi
-if ! test -x "${BINDIR}/aclocal";
+if ! test -x "${BINDIR}/aclocal" && test "${BINDIR}" != "/opt/homebrew/bin";
+then
+	# Default location of Homebrew installed binaries.
+	BINDIR="/opt/homebrew/bin";
+fi
+if ! test -x "${BINDIR}/aclocal" && test "${BINDIR}" != "/mingw32/bin";
 then
 	# Default location of 32-bit MSYS2-MinGW installed binaries.
 	BINDIR="/mingw32/bin";
 fi
-if ! test -x "${BINDIR}/aclocal";
+if ! test -x "${BINDIR}/aclocal" && test "${BINDIR}" != "/mingw64/bin";
 then
 	# Default location of 64-bit MSYS2-MinGW installed binaries.
 	BINDIR="/mingw64/bin";
@@ -91,35 +97,30 @@ else
 
 		exit ${EXIT_FAILURE};
 	fi
-
 	if ! test -x "${AUTOCONF}";
 		then
 		echo "Unable to find: autoconf";
 
 		exit ${EXIT_FAILURE};
 	fi
-
 	if ! test -x "${AUTOHEADER}";
 	then
 		echo "Unable to find: autoheader";
 
 		exit ${EXIT_FAILURE};
 	fi
-
 	if ! test -x "${AUTOMAKE}";
 	then
 		echo "Unable to find: automake";
 
 		exit ${EXIT_FAILURE};
 	fi
-
 	if ! test -x "${AUTOPOINT}";
 	then
 		echo "Unable to find: autopoint";
 
 		exit ${EXIT_FAILURE};
 	fi
-
 	if ! test -x "${LIBTOOLIZE}";
 	then
 		echo "Unable to find: libtoolize";
diff --git a/configure.ac b/configure.ac
index fdde178..fbb1ec5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,12 +1,12 @@
 AC_PREREQ([2.71])
 
 AC_INIT(
- [libhmac],
- [20240923],
- [joachim.metz@gmail.com])
+  [libhmac],
+  [20241028],
+  [joachim.metz@gmail.com])
 
 AC_CONFIG_SRCDIR(
- [include/libhmac.h.in])
+  [include/libhmac.h.in])
 
 AM_INIT_AUTOMAKE([gnu 1.6 tar-ustar])
 AM_EXTRA_RECURSIVE_TARGETS([sources splint])
@@ -122,28 +122,28 @@ CFLAGS="$CFLAGS -Wall";
 
 dnl Check if requires and build requires should be set in spec file
 AS_IF(
- [test "x$ac_cv_libcerror" = xyes || test "x$ac_cv_libcthreads" = xyes || test "x$ac_cv_libcrypto" != xno],
- [AC_SUBST(
-  [libhmac_spec_requires],
-  [Requires:])
- ])
+  [test "x$ac_cv_libcerror" = xyes || test "x$ac_cv_libcthreads" = xyes || test "x$ac_cv_libcrypto" != xno],
+  [AC_SUBST(
+    [libhmac_spec_requires],
+    [Requires:])
+  ])
 
 AS_IF(
- [test "x$ac_cv_libclocale" = xyes || test "x$ac_cv_libcnotify" = xyes || test "x$ac_cv_libcsplit" = xyes || test "x$ac_cv_libuna" = xyes || test "x$ac_cv_libcfile" = xyes || test "x$ac_cv_libcpath" = xyes],
- [AC_SUBST(
-  [libhmac_spec_tools_build_requires],
-  [BuildRequires:])
- ])
+  [test "x$ac_cv_libclocale" = xyes || test "x$ac_cv_libcnotify" = xyes || test "x$ac_cv_libcsplit" = xyes || test "x$ac_cv_libuna" = xyes || test "x$ac_cv_libcfile" = xyes || test "x$ac_cv_libcpath" = xyes],
+  [AC_SUBST(
+    [libhmac_spec_tools_build_requires],
+    [BuildRequires:])
+  ])
 
 dnl Set the date for the dpkg files
 AC_SUBST(
- [DPKG_DATE],
- [`date -R 2> /dev/null`])
+  [DPKG_DATE],
+  [`date -R 2> /dev/null`])
 
 dnl Set the date for the spec file
 AC_SUBST(
- [SPEC_DATE],
- [`date +"%a %b %e %Y" 2> /dev/null`])
+  [SPEC_DATE],
+  [`date +"%a %b %e %Y" 2> /dev/null`])
 
 dnl Generate Makefiles
 AC_CONFIG_FILES([Makefile])
diff --git a/libhmac/libhmac_sha512_context.c b/libhmac/libhmac_sha512_context.c
index 773acd1..7bb7b14 100644
--- a/libhmac/libhmac_sha512_context.c
+++ b/libhmac/libhmac_sha512_context.c
@@ -1267,11 +1267,11 @@ int libhmac_sha512_context_finalize(
 
 		return( -1 );
 	}
-	/* Add padding with a size of 120 mod 128
+	/* Add padding with a size of 112 mod 128
 	 */
 	number_of_blocks = 1;
 
-	if( internal_context->block_offset > 119 )
+	if( internal_context->block_offset > 111 )
 	{
 		number_of_blocks += 1;
 	}
diff --git a/m4/common.m4 b/m4/common.m4
index c2ea816..c229b79 100644
--- a/m4/common.m4
+++ b/m4/common.m4
@@ -1,6 +1,6 @@
 dnl Checks for common headers and functions
 dnl
-dnl Version: 20240513
+dnl Version: 20241013
 
 dnl Function to test if a certain feature was disabled
 AC_DEFUN([AX_COMMON_ARG_DISABLE],
@@ -113,7 +113,7 @@ AC_DEFUN([AX_COMMON_CHECK_ENABLE_VERBOSE_OUTPUT],
     ac_cv_enable_verbose_output=yes])
   ])
 
-dnl Function to detect whether static executables support should be enabled
+dnl Function to detect whether wide character type support should be enabled
 AC_DEFUN([AX_COMMON_CHECK_ENABLE_WIDE_CHARACTER_TYPE],
   [AX_COMMON_ARG_ENABLE(
     [wide-character-type],
diff --git a/setup.cfg.in b/setup.cfg.in
index e89da21..c935d38 100644
--- a/setup.cfg.in
+++ b/setup.cfg.in
@@ -13,4 +13,4 @@ classifiers =
   Programming Language :: Python
 
 [options]
-python_requires = >=3.7
+python_requires = >=3.8
diff --git a/tox.ini b/tox.ini
index 2e47be1..1bdcf01 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = auditwheel,py3{7,8,9,10,11,12}
+envlist = auditwheel,py3{8,9,10,11,12,13}
 
 [testenv]
 usedevelop = True