diff --git a/CMakeLists.txt b/CMakeLists.txt
index 454f4b7..29bd907 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -94,8 +94,8 @@ if(ITKPythonPackage_SUPERBUILD)
 
   set(ITK_REPOSITORY "https://github.com/InsightSoftwareConsortium/ITK.git")
 
-  # master branch, 2024-11-13
-  set(ITK_GIT_TAG "v6.0a01")
+  # main branch, 2025-07-16
+  set(ITK_GIT_TAG "ff4ff13ec295595cab2edbb3173a39ef798e4c7d")
 
   #-----------------------------------------------------------------------------
   # A separate project is used to download ITK, so that it can reused
@@ -120,8 +120,8 @@ if(ITKPythonPackage_SUPERBUILD)
     endif()
 
     ExternalProject_add(oneTBB
-      URL https://github.com/oneapi-src/oneTBB/archive/refs/tags/v2021.9.0.tar.gz
-      URL_HASH SHA256=1ce48f34dada7837f510735ff1172f6e2c261b09460e3bf773b49791d247d24e
+      URL https://github.com/oneapi-src/oneTBB/archive/refs/tags/v2022.2.0.tar.gz
+      URL_HASH SHA256=f0f78001c8c8edb4bddc3d4c5ee7428d56ae313254158ad1eec49eced57f6a5b
       CMAKE_ARGS
         -DTBB_TEST:BOOL=OFF
         -DCMAKE_BUILD_TYPE:STRING=Release
diff --git a/README.md b/README.md
index 882d083..00b039b 100644
--- a/README.md
+++ b/README.md
@@ -85,8 +85,7 @@ documentation for more information on building wheels by hand.
 ITKPythonPackage currently supports building wheels for the following platforms and architectures:
 - Windows 10 x86_64 platforms
 - Windows 11 x86_64 platforms
-- MacOS 10.9+ x86_64 platforms
-- MacOS 11.0+ arm64 platforms
+- MacOS 15.0+ arm64 platforms
 - Linux glibc 2.17+ (E.g. Ubuntu 18.04+) x86_64 platforms
 - Linux glibc 2.28+ (E.g. Ubuntu 20.04+) aarch64 (ARMv8) platforms
 
diff --git a/itkVersion.py b/itkVersion.py
index 775f664..10a4a99 100644
--- a/itkVersion.py
+++ b/itkVersion.py
@@ -1,4 +1,4 @@
-VERSION = '6.0a1'
+VERSION = '6.0b1'
 
 def get_versions():
     """Returns versions for the ITK Python package.
diff --git a/scripts/dockcross-manylinux-build-tarball.sh b/scripts/dockcross-manylinux-build-tarball.sh
index 53a578b..ca29e75 100755
--- a/scripts/dockcross-manylinux-build-tarball.sh
+++ b/scripts/dockcross-manylinux-build-tarball.sh
@@ -4,16 +4,9 @@
 # downloaded by the external module build scripts and used to build their
 # Python package on GitHub CI services.
 
-if test -d /home/kitware/Packaging; then
-  cd /home/kitware/Packaging
-fi
-
 # -----------------------------------------------------------------------
 
 zstd_exe=`(which zstd)`
-if [[ -z ${zstd_exe} && -e /home/kitware/Support/zstd-build/programs/zstd ]]; then
-  zstd_exe=/home/kitware/Support/zstd-build/programs/zstd
-fi
 
 # Find an appropriately versioned zstd.
 #
@@ -38,11 +31,11 @@ fi
 
 # -----------------------------------------------------------------------
 
-tar -c --to-stdout \
+tar -cf ITKPythonBuilds-linux.tar \
   ITKPythonPackage/ITK-* \
   ITKPythonPackage/oneTBB* \
   ITKPythonPackage/requirements-dev.txt \
-  ITKPythonPackage/scripts > ITKPythonBuilds-linux.tar
+  ITKPythonPackage/scripts
 $zstd_exe -f \
   -10 \
   -T6 \
diff --git a/scripts/dockcross-manylinux-set-vars.sh b/scripts/dockcross-manylinux-set-vars.sh
index 6ac55c8..ae0d279 100755
--- a/scripts/dockcross-manylinux-set-vars.sh
+++ b/scripts/dockcross-manylinux-set-vars.sh
@@ -19,13 +19,13 @@
 
 # ITKPythonBuilds archive tag to use for ITK build artifacts.
 #   See https://github.com/insightSoftwareConsortium/ITKpythonbuilds for available tags.
-ITK_PACKAGE_VERSION=${ITK_PACKAGE_VERSION:=v5.4.0}
+ITK_PACKAGE_VERSION=${ITK_PACKAGE_VERSION:=v6.0b01}
 
 # Github organization for fetching ITKPythonPackage build scripts
 ITKPYTHONPACKAGE_ORG=${ITKPYTHONPACKAGE_ORG:=InsightSoftwareConsortium}
 
 # ITKPythonPackage tag for fetching build scripts
-ITKPYTHONPACKAGE_TAG=${ITKPYTHONPACKAGE_TAG:=master}
+ITKPYTHONPACKAGE_TAG=${ITKPYTHONPACKAGE_TAG:=main}
 
 ########################################################################
 # Docker image parameters
@@ -41,7 +41,7 @@ TARGET_ARCH=${TARGET_ARCH:=x64}
 if [[ ${MANYLINUX_VERSION} == _2_28 && ${TARGET_ARCH} == x64 ]]; then
   IMAGE_TAG=${IMAGE_TAG:=20240304-9e57d2b}
 elif [[ ${MANYLINUX_VERSION} == _2_28 && ${TARGET_ARCH} == aarch64 ]]; then
-  IMAGE_TAG=${IMAGE_TAG:=2024-03-25-9206bd9}
+  IMAGE_TAG=${IMAGE_TAG:=2025.07.14-5}
 elif [[ ${MANYLINUX_VERSION} == 2014 ]]; then
   IMAGE_TAG=${IMAGE_TAG:=20240304-9e57d2b}
 else
diff --git a/scripts/macpython-build-module-wheels.sh b/scripts/macpython-build-module-wheels.sh
index 8ad1e8d..32c43bf 100755
--- a/scripts/macpython-build-module-wheels.sh
+++ b/scripts/macpython-build-module-wheels.sh
@@ -95,13 +95,13 @@ for VENV in "${VENVS[@]}"; do
     fi
 
     if [[ $(arch) == "arm64" ]]; then
-      plat_name="macosx-11.0-arm64"
-      osx_target="11.0"
+      plat_name="macosx-15.0-arm64"
+      osx_target="15.0"
       osx_arch="arm64"
       build_path="${SCRIPT_DIR}/../ITK-${py_mm}-macosx_arm64"
     else
-      plat_name="macosx-10.9-x86_64"
-      osx_target="10.9"
+      plat_name="macosx-15.0-x86_64"
+      osx_target="15.0"
       osx_arch="x86_64"
       build_path="${SCRIPT_DIR}/../ITK-${py_mm}-macosx_x86_64"
     fi
diff --git a/scripts/macpython-build-wheels.sh b/scripts/macpython-build-wheels.sh
index 2985aa8..fb04b3e 100755
--- a/scripts/macpython-build-wheels.sh
+++ b/scripts/macpython-build-wheels.sh
@@ -63,11 +63,11 @@ DELOCATE_PATCH=${VENV}/bin/delocate-patch
 build_type="Release"
 
 if [[ $(arch) == "arm64" ]]; then
-  osx_target="11.0"
+  osx_target="15.0"
   osx_arch="arm64"
   use_tbb="OFF"
 else
-  osx_target="10.9"
+  osx_target="15.0"
   osx_arch="x86_64"
   use_tbb="OFF"
 fi
@@ -107,10 +107,10 @@ for VENV in "${VENVS[@]}"; do
     ${Python3_EXECUTABLE} -m pip install --upgrade -r ${SCRIPT_DIR}/../requirements-dev.txt
 
     if [[ $(arch) == "arm64" ]]; then
-      plat_name="macosx-11.0-arm64"
+      plat_name="macosx-15.0-arm64"
       build_path="${SCRIPT_DIR}/../ITK-${py_mm}-macosx_arm64"
     else
-      plat_name="macosx-10.9-x86_64"
+      plat_name="macosx-15.0-x86_64"
       build_path="${SCRIPT_DIR}/../ITK-${py_mm}-macosx_x86_64"
     fi
     if [[ ! -z "${MACOSX_DEPLOYMENT_TARGET}" ]]; then
diff --git a/scripts/macpython-delocate-wheels.sh b/scripts/macpython-delocate-wheels.sh
index 2f16cbe..60ac661 100755
--- a/scripts/macpython-delocate-wheels.sh
+++ b/scripts/macpython-delocate-wheels.sh
@@ -53,11 +53,11 @@ DELOCATE_PATCH=${VENV}/bin/delocate-patch
 build_type="Release"
 
 if [[ $(arch) == "arm64" ]]; then
-  osx_target="11.0"
+  osx_target="15.0"
   osx_arch="arm64"
   use_tbb="OFF"
 else
-  osx_target="10.9"
+  osx_target="15.0"
   osx_arch="x86_64"
   use_tbb="OFF"
 fi