diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
deleted file mode 100644
index bc47660b..00000000
--- a/.github/workflows/python-publish.yml
+++ /dev/null
@@ -1,250 +0,0 @@
-
-name: Build binary wheels and upload to PyPI
-
-on:
-  release:
-    types: [created]
-  schedule:
-    # Build nightly at 05:43 UTC
-    - cron:  '43 5 * * *'
-  workflow_dispatch:  # allow running manually from 'Actions' tab
-
-jobs:
-  build-source-distribution:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    - name: Set up Python
-      uses: actions/setup-python@v5
-    - name: Build
-      run: python setup.py sdist
-    - uses: actions/upload-artifact@v3
-      with:
-        name: python-package-distributions
-        path: dist/
-
-  build-wheels-linux:
-    name: Build wheels on ${{ matrix.os }} - ${{ matrix.arch }}
-
-    strategy:
-      matrix:
-        os:
-        - ubuntu-20.04
-        arch:
-        - x86_64
-        - i686
-        - aarch64
-
-    runs-on: ${{ matrix.os }}
-
-    steps:
-    - uses: actions/checkout@v4
-      with:
-        submodules: 'recursive'
-
-    - name: Set up QEMU for ARM64 cross compile
-      if: ${{ matrix.arch }} == 'aarch64'
-      id: qemu
-      uses: docker/setup-qemu-action@v3
-
-    - name: Build Wheels
-      uses: pypa/cibuildwheel@v2.16.2
-      env:
-        CIBW_ARCHS_LINUX: ${{ matrix.arch }}
-        CIBW_ENVIRONMENT: >
-            CRC32C_PURE_PYTHON="0"
-            CRC32C_INSTALL_PREFIX="$(pwd)/usr"
-        CIBW_BUILD_VERBOSITY: 1
-        # Build the C library inside CIBW so that the manylinux image is
-        # used to link the share library;  otherwise, our extension wouldn't
-        # be able to link with it.
-        CIBW_BEFORE_BUILD: >
-            python -m pip install --require-hashes -r scripts/requirements.txt &&
-            cmake -S google_crc32c -B build \
-                -DCMAKE_BUILD_TYPE=Release \
-                -DCRC32C_BUILD_TESTS=no \
-                -DCRC32C_BUILD_BENCHMARKS=no \
-                -DBUILD_SHARED_LIBS=yes \
-                -DCMAKE_INSTALL_PREFIX:PATH=$(pwd)/usr &&
-            make -C build all install
-        CIBW_TEST_REQUIRES: pytest
-        CIBW_TEST_COMMAND: py.test -v {project}/tests/
-
-    - uses: actions/upload-artifact@v3
-      with:
-        name: python-package-distributions
-        path: wheelhouse/
-
-  build-wheels-macos:
-    name: Build wheels on ${{ matrix.os }} - ${{ matrix.arch }}
-    strategy:
-      matrix:
-        os:
-        - macos-10.15
-       #- macos-11
-        arch:
-        - x86_64
-        - universal2
-    runs-on: ${{ matrix.os }}
-    steps:
-
-    - uses: actions/checkout@v4
-      with:
-        submodules: 'recursive'
-
-    - name: Get C library hash
-      id: get-c-lib-hash
-      run:
-        echo "::set-output name=hash::$(git -C google_crc32c log -n 1 --pretty=%H)"
-
-    - id: load-cache
-      name: Load cached C library
-      uses: actions/cache@v3
-      with:
-        path: ${{ github.workspace }}/usr
-        key:
-            libcrc32c-${{ matrix.os }}-${{ steps.get-c-lib-hash.outputs.hash }}
-
-    - name: Build C Library
-      if: steps.load-cache.outputs.cache-hit != 'true'
-      run: >
-        python -m pip install --require-hashes -r scripts/requirements.txt &&
-        cmake -S google_crc32c -B build \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DCMAKE_OSX_DEPLOYMENT_TARGET=10.9 \
-            -DCMAKE_OSX_ARCHITECTURES="arm64;x86_64" \
-            -DCRC32C_BUILD_TESTS=no \
-            -DCRC32C_BUILD_BENCHMARKS=no \
-            -DBUILD_SHARED_LIBS=yes \
-            -DCMAKE_INSTALL_PREFIX:PATH=${{ github.workspace }}/usr \
-            -DCMAKE_INSTALL_NAME_DIR:PATH=${{ github.workspace }}/usr/lib &&
-        make -C build all install
-
-    - name: Build Wheels
-      uses: pypa/cibuildwheel@v2.16.2
-      env:
-        CIBW_ARCHS_MACOS: ${{ matrix.arch }}
-        CIBW_ENVIRONMENT: >
-            CRC32C_PURE_PYTHON="0"
-            CRC32C_INSTALL_PREFIX="$(pwd)/usr"
-        CIBW_BUILD_VERBOSITY: 1
-        CIBW_TEST_REQUIRES: pytest
-        CIBW_TEST_COMMAND: py.test -v {project}/tests/
-
-    - uses: actions/upload-artifact@v3
-      with:
-        name: python-package-distributions
-        path: wheelhouse/
-
-  build-wheels-windows:
-    name: Build wheels on ${{ matrix.os }} ( ${{ matrix.platform }} )
-
-    strategy:
-      matrix:
-        os:
-        - windows-2019
-        platform:
-        - x64
-        - Win32
-
-    runs-on: ${{ matrix.os }}
-
-    steps:
-
-    - uses: actions/checkout@v4
-      with:
-        submodules: 'recursive'
-
-    - name: Get C library hash
-      id: get-c-lib-hash
-      run:
-        echo "::set-output name=hash::$(git -C google_crc32c log -n 1 --pretty=%H)"
-
-    - id: load-cache
-      name: Load cached C library
-      uses: actions/cache@v3
-      with:
-        path: ${{ github.workspace }}\usr
-        key:
-            libcrc32c-${{ matrix.os }}-${{ matrix.platform }}-${{ steps.get-c-lib-hash.outputs.hash }}
-
-    - name: Build C Library
-      if: steps.load-cache.outputs.cache-hit != 'true'
-      run: |
-        python -m pip install --require-hashes -r scripts/requirements.txt
-        cmake -S google_crc32c -B build -G "Visual Studio 16 2019" -A ${{ matrix.platform }} -DCRC32C_BUILD_BENCHMARKS=no -DCRC32C_BUILD_TESTS=no -DBUILD_SHARED_LIBS=no -DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=yes -DCRC32C_USE_GLOG=0
-        cmake --build build --verbose --config Release
-        cmake --install build --verbose --config Release --prefix=${{ github.workspace }}\usr\
-
-    # Passing through ${{ github.workspace }} to CIBW_ENVIRONMENT mangles
-    # backslashes:  compute a variant which uses only forward-slashses.
-    - id: crc32c-install-prefix
-      name: Dead-reckon a CIBW-compatible install prefix
-      shell: bash
-      run: |
-        python -c "import os; workspace = '/'.join(os.getenv('GITHUB_WORKSPACE').split(os.sep)); pfx = f'{workspace}/usr'; print(f'::set-output name=prefix::{pfx}')"
-
-    - id: platform-arch
-      name: Map platform -> wheel arch
-      shell: bash
-      run: |
-        if [[ "${{ matrix.platform }}" == "Win32" ]]; then
-            echo "::set-output name=arch::x86"
-        else
-            echo "::set-output name=arch::AMD64"
-        fi
-
-    - name: Build Wheels
-      uses: pypa/cibuildwheel@v2.16.2
-      env:
-        CIBW_ARCHS_WINDOWS: ${{ steps.platform-arch.outputs.arch }}
-        CIBW_ENVIRONMENT: >
-            CRC32C_INSTALL_PREFIX="${{ steps.crc32c-install-prefix.outputs.prefix }}"
-            CRC32C_PURE_PYTHON="0"
-        CIBW_BUILD_VERBOSITY: 1
-        CIBW_TEST_REQUIRES: pytest
-        CIBW_TEST_COMMAND: py.test -v {project}/tests
-
-    - uses: actions/upload-artifact@v3
-      with:
-        name: python-package-distributions
-        path: wheelhouse/
-
-
-  publish:
-    if: github.event_name == 'release'
-    needs:
-      - build-source-distribution
-      - build-wheels-linux
-      - build-wheels-macos
-      - build-wheels-windows
-    runs-on: ubuntu-latest
-    steps:
-      - name: Download all the dists
-        uses: actions/download-artifact@v3
-        with:
-          name: python-package-distributions
-          path: dist/
-      - name: Download all the wheels
-        uses: actions/download-artifact@v3
-        with:
-          name: python-package-distributions
-          path: wheelhouse/
-      - name: What will we publish?
-        run: ls wheelhouse/
-      - name: Publish Source Distribution
-        uses: pypa/gh-action-pypi-publish@master
-        with:
-          user: __token__
-          password: ${{ secrets.PYPI_API_TOKEN }}
-          packages_dir: dist/
-          skip_existing: true
-          # repository_url: https://test.pypi.org/legacy/
-      - name: Publish Wheels
-        uses: pypa/gh-action-pypi-publish@master
-        with:
-          user: __token__
-          password: ${{ secrets.PYPI_API_TOKEN }}
-          packages_dir: wheelhouse/
-          skip_existing: true
-          # repository_url: https://test.pypi.org/legacy/
diff --git a/.kokoro/build-manylinux.sh b/.kokoro/build-manylinux.sh
new file mode 100755
index 00000000..057c5bc9
--- /dev/null
+++ b/.kokoro/build-manylinux.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Need enchant for spell check
+sudo apt-get update
+sudo apt-get -y install dictionaries-common aspell aspell-en \
+	                hunspell-en-us libenchant1c2a enchant
+
+set -eo pipefail
+
+# Disable buffering, so that the logs stream through.
+export PYTHONUNBUFFERED=1
+
+# Debug: show build environment
+env | grep KOKORO
+
+cd github/python-crc32c
+
+# Before running nox and such, build the extension.
+./scripts/manylinux/build.sh
+./scripts/manylinux/check.sh
diff --git a/.kokoro/build-osx.sh b/.kokoro/build-osx.sh
new file mode 100755
index 00000000..4e04cdb6
--- /dev/null
+++ b/.kokoro/build-osx.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eo pipefail
+
+# Disable buffering, so that the logs stream through.
+export PYTHONUNBUFFERED=1
+
+# Debug: show build environment
+env | grep KOKORO
+
+cd github/python-crc32c
+
+# Before running nox and such, build the extension.
+./scripts/osx/build.sh
+./scripts/osx/check.sh
diff --git a/.kokoro/build.sh b/.kokoro/build.sh
index 92ab3036..9b5bcc34 100755
--- a/.kokoro/build.sh
+++ b/.kokoro/build.sh
@@ -20,6 +20,14 @@ if [[ -z "${PROJECT_ROOT:-}" ]]; then
 fi
 
 cd "${PROJECT_ROOT}"
+# Need enchant for spell check
+sudo apt-get update
+sudo apt-get -y install dictionaries-common aspell aspell-en \
+	                hunspell-en-us libenchant1c2a enchant
+
+set -eo pipefail
+
+cd github/python-crc32c
 
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1
@@ -27,6 +35,9 @@ export PYTHONUNBUFFERED=1
 # Debug: show build environment
 env | grep KOKORO
 
+# Setup firestore account credentials
+export FIRESTORE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/firebase-credentials.json
+
 # Setup service account credentials.
 export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
 
diff --git a/.kokoro/continuous/crc32c.cfg b/.kokoro/continuous/crc32c.cfg
new file mode 100644
index 00000000..495836ce
--- /dev/null
+++ b/.kokoro/continuous/crc32c.cfg
@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
diff --git a/.kokoro/presubmit.bat b/.kokoro/presubmit.bat
new file mode 100644
index 00000000..71c6511d
--- /dev/null
+++ b/.kokoro/presubmit.bat
@@ -0,0 +1,32 @@
+@rem Copyright 2019 Google LLC. All rights reserved.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem     http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+
+@echo "Starting Windows build"
+
+cd /d %~dp0
+cd ..
+
+@rem as this package uses submodules make sure we have all content
+call git config --global --add safe.directory C:/tmpfs/src/github/python-crc32c
+call git submodule update --recursive || goto :error
+
+@echo "Build Wheels and Run Tests"
+call scripts\windows\build.bat || goto :error
+
+for /r %%a in (*.whl) do xcopy "%%a" %KOKORO_ARTIFACTS_DIR% /i
+
+goto :EOF
+
+:error
+exit /b 1
diff --git a/.kokoro/presubmit/linux/common.cfg b/.kokoro/presubmit/linux/common.cfg
new file mode 100644
index 00000000..bf66b2f3
--- /dev/null
+++ b/.kokoro/presubmit/linux/common.cfg
@@ -0,0 +1,27 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Download resources for system tests (service account key, etc.)
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/google-cloud-python"
+
+# Use the trampoline script to run in docker.
+build_file: "python-crc32c/.kokoro/trampoline.sh"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-multi"
+}
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/build.sh"
+}
diff --git a/.kokoro/presubmit/linux/presubmit-linux.cfg b/.kokoro/presubmit/linux/presubmit-linux.cfg
new file mode 100644
index 00000000..c0f213b7
--- /dev/null
+++ b/.kokoro/presubmit/linux/presubmit-linux.cfg
@@ -0,0 +1,8 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
+build_file: "python-crc32c/.kokoro/build-manylinux.sh"
diff --git a/.kokoro/presubmit/osx/common.cfg b/.kokoro/presubmit/osx/common.cfg
new file mode 100644
index 00000000..bf66b2f3
--- /dev/null
+++ b/.kokoro/presubmit/osx/common.cfg
@@ -0,0 +1,27 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Download resources for system tests (service account key, etc.)
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/google-cloud-python"
+
+# Use the trampoline script to run in docker.
+build_file: "python-crc32c/.kokoro/trampoline.sh"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-multi"
+}
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/build.sh"
+}
diff --git a/.kokoro/presubmit/osx/presubmit-osx-slcn.cfg b/.kokoro/presubmit/osx/presubmit-osx-slcn.cfg
new file mode 100644
index 00000000..81c893d2
--- /dev/null
+++ b/.kokoro/presubmit/osx/presubmit-osx-slcn.cfg
@@ -0,0 +1,9 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
+
+build_file: "python-crc32c/.kokoro/build-osx.sh"
diff --git a/.kokoro/presubmit/osx/presubmit-osx.cfg b/.kokoro/presubmit/osx/presubmit-osx.cfg
new file mode 100644
index 00000000..81c893d2
--- /dev/null
+++ b/.kokoro/presubmit/osx/presubmit-osx.cfg
@@ -0,0 +1,9 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
+
+build_file: "python-crc32c/.kokoro/build-osx.sh"
diff --git a/.kokoro/presubmit/windows/common.cfg b/.kokoro/presubmit/windows/common.cfg
new file mode 100644
index 00000000..44a039a9
--- /dev/null
+++ b/.kokoro/presubmit/windows/common.cfg
@@ -0,0 +1,27 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Download resources for system tests (service account key, etc.)
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/google-cloud-python"
+
+# Use the trampoline script to run in docker.
+build_file: "python-crc32c/.kokoro/presubmit.bat"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-multi"
+}
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/build.sh"
+}
diff --git a/.kokoro/presubmit/windows/presubmit-windows.cfg b/.kokoro/presubmit/windows/presubmit-windows.cfg
new file mode 100644
index 00000000..495836ce
--- /dev/null
+++ b/.kokoro/presubmit/windows/presubmit-windows.cfg
@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
diff --git a/.kokoro/release-manylinux-wheel.sh b/.kokoro/release-manylinux-wheel.sh
new file mode 100755
index 00000000..f40b0a7f
--- /dev/null
+++ b/.kokoro/release-manylinux-wheel.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -eo pipefail
+
+cd github/python-crc32c
+
+# Build for ManyLinux
+./scripts/manylinux/build.sh
+
+REPO_ROOT=$(pwd)
+
+mkdir ${REPO_ROOT}/../pypi
+
+docker run \
+    --rm \
+    --interactive \
+    --env REPO_ROOT=/var/code/python-crc32c/ \
+    --volume ${REPO_ROOT}:/var/code/python-crc32c/ \
+    --volume ${KOKORO_KEYSTORE_DIR}:/keys \
+    quay.io/pypa/manylinux2014_x86_64 \
+    /var/code/python-crc32c/.kokoro/release.sh
diff --git a/.kokoro/release-osx-wheel.sh b/.kokoro/release-osx-wheel.sh
new file mode 100755
index 00000000..2f376546
--- /dev/null
+++ b/.kokoro/release-osx-wheel.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -eo pipefail
+
+REPO_ROOT=$(pwd)/github/python-crc32c
+cd github/python-crc32c
+
+# Build for OSX
+./scripts/osx/build.sh
+
+# REPO_ROOT=$(pwd)
+./.kokoro/release.sh
diff --git a/.kokoro/release-windows-wheel.bat b/.kokoro/release-windows-wheel.bat
new file mode 100755
index 00000000..d349e03f
--- /dev/null
+++ b/.kokoro/release-windows-wheel.bat
@@ -0,0 +1,44 @@
+@rem Copyright 2019 Google LLC. All rights reserved.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem     http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+
+@echo "Starting Windows release"
+
+cd /d %~dp0
+cd ..
+
+@echo "Build Wheel"
+call scripts\windows\build.bat || goto :error
+
+@echo "Start the releasetool reporter"
+call py -3 -m pip install gcp-releasetool || goto :error
+call py -3 -m releasetool publish-reporter-script > C:\temp\publisher-script || goto :error
+
+@echo "Ensure that we have the latest versions of Twine, Wheel, and Setuptools."
+call py -3 -m pip install --upgrade twine wheel setuptools || goto :error
+
+@echo "Disable buffering, so that the logs stream through."
+set PYTHONUNBUFFERED=1
+
+@echo "## RELASE WORKFLOW SUCCESSFUL ##"
+@echo "## Uploading Wheels ##"
+
+@echo "Move into the package, build the distribution and upload."
+set /p TWINE_PASSWORD=<%KOKORO_KEYSTORE_DIR%/73713_google-cloud-pypi-token-keystore-1
+call py -3 setup.py sdist || goto :error
+@REM call py -3 -m twine upload --skip-existing --username gcloudpypi --password "%TWINE_PASSWORD%" dist/* wheels/google_crc32c* || goto :error
+
+goto :EOF
+
+:error
+exit /b 1
diff --git a/.kokoro/release.sh b/.kokoro/release.sh
index 8e509855..6e7d411f 100755
--- a/.kokoro/release.sh
+++ b/.kokoro/release.sh
@@ -14,16 +14,59 @@
 # limitations under the License.
 
 set -eo pipefail
+echo "Release script started"
+
+if [ "$(uname)" == "Darwin" ]; then
+    # Mac OS
+    PYTHON=$(PYENV_VERSION=3.9 pyenv which python)
+    PYTHON_BIN=$(dirname ${PYTHON})
+
+    RELEASETOOL=${PYTHON_BIN}/releasetool
+    TWINE=${PYTHON_BIN}/twine
+    ${PYTHON} -m pip install gcp-releasetool twine --user
+
+    echo "Change to code directory"
+    REPO_ROOT=$(pwd)
+    cd "${REPO_ROOT}"
+    ls
+
+else
+    # Kokoro Linux
+    mv /keys/73713_google-cloud-pypi-token-keystore-1 /73713_google-cloud-pypi-token-keystore-1
+
+    PATH=/opt/python/cp39-cp39/bin/:$PATH
+    PYTHON_BIN=/opt/python/cp39-cp39/bin/
+    RELEASETOOL=${PYTHON_BIN}/releasetool
+    PYTHON=${PYTHON_BIN}/python
+    TWINE=${PYTHON_BIN}/twine
+    ${PYTHON} -m pip install gcp-releasetool twine
+
+    echo "Change to code directory"
+    REPO_ROOT=/var/code/python-crc32c/
+    cd "${REPO_ROOT}"
+    ls
+
+fi
+
+echo "Download dependencies for release script"
 
 # Start the releasetool reporter
-python3 -m pip install --require-hashes -r github/python-crc32c/.kokoro/requirements.txt
-python3 -m releasetool publish-reporter-script > /tmp/publisher-script; source /tmp/publisher-script
+${PYTHON} -m pip install --require-hashes -r ${REPO_ROOT}/.kokoro/requirements.txt
+${RELEASETOOL} publish-reporter-script > /tmp/publisher-script; source /tmp/publisher-script
+
+# Ensure that we have the latest versions of Twine, Wheel, and Setuptools.
+${PYTHON} -m pip install --upgrade twine wheel setuptools --user
 
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1
-
+echo "## RELASE WORKFLOW SUCCESSFUL ##"
+echo "## Uploading Wheels ##"
+# TODO: ONE OF THE BELOW WORKS
 # Move into the package, build the distribution and upload.
 TWINE_PASSWORD=$(cat "${KOKORO_KEYSTORE_DIR}/73713_google-cloud-pypi-token-keystore-1")
 cd github/python-crc32c
 python3 setup.py sdist bdist_wheel
-twine upload --username __token__ --password "${TWINE_PASSWORD}" dist/*
+#twine upload --username __token__ --password "${TWINE_PASSWORD}" dist/*
+
+${PYTHON} setup.py sdist
+# ${TWINE} upload --skip-existing --username gcloudpypi --password "${TWINE_PASSWORD}" dist/* wheels/*
diff --git a/.kokoro/release/linux/common.cfg b/.kokoro/release/linux/common.cfg
new file mode 100644
index 00000000..694320c7
--- /dev/null
+++ b/.kokoro/release/linux/common.cfg
@@ -0,0 +1,44 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "python-crc32c/.kokoro/trampoline.sh"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-multi"
+}
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/release.sh"
+}
+
+# Fetch the token needed for reporting release status to GitHub
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "yoshi-automation-github-key"
+    }
+  }
+}
+
+# Fetch PyPI password
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "google-cloud-pypi-token-keystore-1"
+    }
+  }
+}
diff --git a/.kokoro/release/linux/linux_wheel.cfg b/.kokoro/release/linux/linux_wheel.cfg
new file mode 100644
index 00000000..0c32ba5e
--- /dev/null
+++ b/.kokoro/release/linux/linux_wheel.cfg
@@ -0,0 +1,14 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/release-manylinux-wheel.sh"
+}
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
+
+build_file: "python-crc32c/.kokoro/release-manylinux-wheel.sh"
diff --git a/.kokoro/release/osx/common.cfg b/.kokoro/release/osx/common.cfg
new file mode 100644
index 00000000..694320c7
--- /dev/null
+++ b/.kokoro/release/osx/common.cfg
@@ -0,0 +1,44 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "python-crc32c/.kokoro/trampoline.sh"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-multi"
+}
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/release.sh"
+}
+
+# Fetch the token needed for reporting release status to GitHub
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "yoshi-automation-github-key"
+    }
+  }
+}
+
+# Fetch PyPI password
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "google-cloud-pypi-token-keystore-1"
+    }
+  }
+}
diff --git a/.kokoro/release/osx/osx_wheel.cfg b/.kokoro/release/osx/osx_wheel.cfg
new file mode 100644
index 00000000..3a40d7a8
--- /dev/null
+++ b/.kokoro/release/osx/osx_wheel.cfg
@@ -0,0 +1,14 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/release-osx-wheel.sh"
+}
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
+
+build_file: "python-crc32c/.kokoro/release-osx-wheel.sh"
diff --git a/.kokoro/release/windows/common.cfg b/.kokoro/release/windows/common.cfg
new file mode 100644
index 00000000..694320c7
--- /dev/null
+++ b/.kokoro/release/windows/common.cfg
@@ -0,0 +1,44 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "python-crc32c/.kokoro/trampoline.sh"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-multi"
+}
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/release.sh"
+}
+
+# Fetch the token needed for reporting release status to GitHub
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "yoshi-automation-github-key"
+    }
+  }
+}
+
+# Fetch PyPI password
+before_action {
+  fetch_keystore {
+    keystore_resource {
+      keystore_config_id: 73713
+      keyname: "google-cloud-pypi-token-keystore-1"
+    }
+  }
+}
diff --git a/.kokoro/release/windows/windows_wheel.cfg b/.kokoro/release/windows/windows_wheel.cfg
new file mode 100644
index 00000000..1f640148
--- /dev/null
+++ b/.kokoro/release/windows/windows_wheel.cfg
@@ -0,0 +1,14 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-crc32c/.kokoro/release-windows-wheel.sh"
+}
+
+# Tell the trampoline which build file to use.
+env_vars: {
+    key: "PACKAGE"
+    value: "crc32c"
+}
+
+build_file: "python-crc32c/.kokoro/release-windows-wheel.bat"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index efb079d9..1e35adaa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,20 @@
 
 [1]: https://pypi.org/project/google-crc32c/#history
 
+## [1.6.0.dev1](https://github.com/googleapis/python-crc32c/compare/v1.5.0...v1.6.0.dev1) (2024-07-09)
+
+
+### Features
+
+* Add support for python 3.12 ([#177](https://github.com/googleapis/python-crc32c/issues/177)) ([5ff1207](https://github.com/googleapis/python-crc32c/commit/5ff1207e7b60256e7a32932324ccb9ad4ec265d2))
+
+
+### Bug Fixes
+
+* Remove manylinux1 which is no longer supported by PyPA ([#186](https://github.com/googleapis/python-crc32c/issues/186)) ([79edb3f](https://github.com/googleapis/python-crc32c/commit/79edb3fd3cda0e4193a6fb6a8346058398df43de))
+* Update CI to use kokoro and build for OSX, Windows, Linux ([#214](https://github.com/googleapis/python-crc32c/pull/214))
+
+
 ## [1.5.0](https://github.com/googleapis/python-crc32c/compare/v1.4.0...v1.5.0) (2022-08-31)
 
 
diff --git a/README.md b/README.md
index f59697f5..8b889fbf 100644
--- a/README.md
+++ b/README.md
@@ -9,9 +9,9 @@ C toolchain.
 
 # Currently Published Wheels
 
-Wheels are currently published for Python 3.7, 3.8, 3.9, 3.10, 3.11 and
-pypy-3.7 for multiple architectures. For information on building your own,
-please view [BUILDING.md](BUILDING.md).
+Wheels are currently published for CPython 3.8, 3.9, 3.10, 3.11 and 3.12
+for multiple architectures. PyPy 3.9 and 3.10 are also supported for Linux.
+For information on building your own wheels please view [BUILDING.md](BUILDING.md).
 
 
 ## Linux
@@ -28,9 +28,9 @@ See https://github.com/pypa/manylinux/issues/994.
 
 ## Mac OS
 
-Wheels are published for `x86_64` and `universal2` architectures.
+Wheels are published for `x86_64` and `arm64` architectures.
 
 
 ## Windows
 
-Wheels are published for `win32` and `win_amd64` architectures.
+Wheels are published for the `win_amd64` architecture.
diff --git a/scripts/manylinux/build.sh b/scripts/manylinux/build.sh
index 1b0e565f..c539bc77 100755
--- a/scripts/manylinux/build.sh
+++ b/scripts/manylinux/build.sh
@@ -23,9 +23,12 @@ REPO_ROOT=$(dirname ${SCRIPTS_DIR})
 
 
 cd $REPO_ROOT
-git submodule update --init --recursive 
+# Add directory as safe to avoid "detected dubious ownership" fatal issue1
+git config --global --add safe.directory $REPO_ROOT
+git config --global --add safe.directory $REPO_ROOT/google_crc32c
+git submodule update --init --recursive
 
-docker pull quay.io/pypa/manylinux2010_x86_64	
+docker pull quay.io/pypa/manylinux2010_x86_64
 docker run \
     --rm \
     --interactive \
@@ -52,3 +55,13 @@ docker run \
     --env BUILD_PYTHON=${BUILD_PYTHON} \
     quay.io/pypa/manylinux2014_aarch64 \
     /var/code/python-crc32c/scripts/manylinux/build_on_centos.sh
+
+echo "Build completed"
+
+# Upload wheels to GCS for debugging. Uncomment only when needed.
+
+export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
+gcloud auth activate-service-account --key-file=${GOOGLE_APPLICATION_CREDENTIALS}
+ls ${REPO_ROOT}/wheels/
+gsutil cp ${REPO_ROOT}/wheels/* gs://python_crc32c/
+echo "Linux wheels uploaded successfully"
diff --git a/scripts/manylinux/build_on_centos.sh b/scripts/manylinux/build_on_centos.sh
index e6d2871d..300b9f28 100755
--- a/scripts/manylinux/build_on_centos.sh
+++ b/scripts/manylinux/build_on_centos.sh
@@ -24,6 +24,8 @@ ${MAIN_PYTHON_BIN}/python -m pip install --upgrade pip
 # Install `cmake` (i.e. non-Python build dependency).
 ${MAIN_PYTHON_BIN}/python -m pip install "cmake >= 3.12.0"
 # Install Python build dependencies.
+# cd ${REPO_ROOT}
+# ${MAIN_PYTHON_BIN}/pip install .
 ${MAIN_PYTHON_BIN}/python -m pip install \
     --requirement ${REPO_ROOT}/scripts/dev-requirements.txt
 
@@ -45,10 +47,7 @@ if [[ -z ${BUILD_PYTHON} ]]; then
     # Collect all target Python versions.
     for PYTHON_BIN in /opt/python/*/bin; do
         # H/T: https://stackoverflow.com/a/229606/1068170
-        if [[ "${PYTHON_BIN}" == *"37"* ]]; then
-            PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
-            continue
-        elif [[ "${PYTHON_BIN}" == *"38"* ]]; then
+        if [[ "${PYTHON_BIN}" == *"38"* ]]; then
             PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
             continue
         elif [[ "${PYTHON_BIN}" == *"39"* ]]; then
@@ -57,6 +56,12 @@ if [[ -z ${BUILD_PYTHON} ]]; then
         elif [[ "${PYTHON_BIN}" == *"310"* ]]; then
             PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
             continue
+        elif [[ "${PYTHON_BIN}" == *"311"* ]]; then
+            PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+            continue
+        elif [[ "${PYTHON_BIN}" == *"312"* ]]; then
+            PYTHON_VERSIONS="${PYTHON_VERSIONS} ${PYTHON_BIN}"
+            continue
         else
             echo "Ignoring unsupported version: ${PYTHON_BIN}"
             echo "====================================="
@@ -88,3 +93,5 @@ done
 # Clean up.
 rm -fr ${REPO_ROOT}/google_crc32c/build/
 rm -fr ${REPO_ROOT}/dist_wheels/
+
+echo "Centos Build completed"
diff --git a/scripts/manylinux/check.sh b/scripts/manylinux/check.sh
index 25db1687..73a3e139 100755
--- a/scripts/manylinux/check.sh
+++ b/scripts/manylinux/check.sh
@@ -20,25 +20,47 @@ echo "CHECKING ON LINUX"
 
 VERSION=$(awk "/version \= ([0-9.]+)/" setup.cfg)
 PACKAGE_VERSION=${VERSION:10}
-WHEEL_FILE="wheels/google_crc32c-${PACKAGE_VERSION}-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl"
-PYTHON=python3.7
 
-# Using pyenv, set 3.7.13 as a local python version.
-# pyenv versions
-pyenv local 3.7.13
+# set up pyenv & shell environment for switching across python versions
+eval "$(pyenv init -)"
+eval "$(pyenv init --path)"
+install_python_pyenv() {
+    version=$1
 
-# Make sure we can create a virtual environment.
-${PYTHON} -m pip install --upgrade setuptools pip wheel
+    if [ -z "$(pyenv versions --bare | grep $version)" ]; then
+        echo "Python $version is not installed. Installing..."
+        pyenv install $version
+        echo "Python $version installed."
+    else
+        echo "Python $version is already installed."
+    fi
+    pyenv shell $version
+}
 
-# Create a virtual environment.
-${PYTHON} -m venv venv
+SUPPORTED_PYTHON_VERSIONS=("3.8" "3.9" "3.10" "3.11" "3.12")
 
-# Install the wheel.
-venv/bin/pip install ${WHEEL_FILE}
+for PYTHON_VERSION in "${SUPPORTED_PYTHON_VERSIONS[@]}"; do
+    PYTHON=python${PYTHON_VERSION}
+    install_python_pyenv ${PYTHON_VERSION}
+    ${PYTHON} -m pip install --upgrade setuptools pip wheel
 
-# Verify that the module is installed and peek at contents.
-venv/bin/python scripts/check_crc32c_extension.py
-unzip -l ${WHEEL_FILE}
+    # Create a virtual environment.
+    ${PYTHON} -m venv venv
 
-# Clean up.
-rm -fr venv/
+    # Note that the 'm' SOABI flag is no longer supported for Python >= 3.8
+    SOABI_FLAG="m"
+    if [ "${PYTHON_VERSION}" != "3.7" ]; then
+        SOABI_FLAG=""
+    fi
+
+    # Install the wheel.
+    WHEEL_FILE="wheels/google_crc32c-${PACKAGE_VERSION}-cp${PYTHON_VERSION//.}-cp${PYTHON_VERSION//.}${SOABI_FLAG}-manylinux_2_17_x86_64.manylinux2014_x86_64.whl"
+    venv/bin/pip install ${WHEEL_FILE}
+
+    # Verify that the module is installed and peek at contents.
+    venv/bin/python scripts/check_crc32c_extension.py
+    unzip -l ${WHEEL_FILE}
+
+    # Clean up.
+    rm -fr venv/
+done
diff --git a/scripts/osx/build.sh b/scripts/osx/build.sh
index bccfb838..56f88754 100755
--- a/scripts/osx/build.sh
+++ b/scripts/osx/build.sh
@@ -16,6 +16,9 @@
 set -e -x
 echo "BUILDING FOR OSX"
 
+# set deployment target
+export MACOSX_DEPLOYMENT_TARGET=12
+
 # ``readlink -f`` is not our friend on OS X. This relies on **some**
 # ``python`` being installed.
 SCRIPT_FI=$(python -c "import os; print(os.path.realpath('${0}'))")
@@ -23,47 +26,30 @@ OSX_DIR=$(dirname ${SCRIPT_FI})
 SCRIPTS_DIR=$(dirname ${OSX_DIR})
 export REPO_ROOT=$(dirname ${SCRIPTS_DIR})
 
-# NOTE: These are the Python.org versions of Python.
-PYTHON37="/Library/Frameworks/Python.framework/Versions/3.7/bin"
-PYTHON38="/Library/Frameworks/Python.framework/Versions/3.8/bin"
-PYTHON39="/Library/Frameworks/Python.framework/Versions/3.9/bin"
-PYTHON310="/Library/Frameworks/Python.framework/Versions/3.10/bin"
-PYTHON311="/Library/Frameworks/Python.framework/Versions/3.11/bin"
+# install required packages for pyenv
+# https://github.com/pyenv/pyenv/wiki#suggested-build-environment
+brew install openssl readline sqlite3 xz zlib tcl-tk
 
 # Build and install `libcrc32c`
 export PY_BIN="${PY_BIN:-python3}"
 export CRC32C_INSTALL_PREFIX="${REPO_ROOT}/usr"
 
 cd ${REPO_ROOT}
+# Add directory as safe to avoid "detected dubious ownership" fatal issue
+git config --global --add safe.directory $REPO_ROOT
+git config --global --add safe.directory $REPO_ROOT/google_crc32c
 git submodule update --init --recursive
 
 ${OSX_DIR}/build_c_lib.sh
 
-# Build wheel for Python 3.7.
-export PY_BIN="python3.7"
-export PY_TAG="cp37-cp37m"
-${OSX_DIR}/build_python_wheel.sh
-
-# Build wheel for Python 3.8.
-# Note that the 'm' SOABI flag is no longer supported for Python >= 3.8
-export PY_BIN="python3.8"
-export PY_TAG="cp38-cp38"
-${OSX_DIR}/build_python_wheel.sh
-
-# Build wheel for Python 3.9.
-export PY_BIN="python3.9"
-export PY_TAG="cp39-cp39"
-${OSX_DIR}/build_python_wheel.sh
-
-# Build wheel for Python 3.10.
-export PY_BIN="python3.10"
-export PY_TAG="cp310-cp310"
-${OSX_DIR}/build_python_wheel.sh
+SUPPORTED_PYTHON_VERSIONS=("3.8" "3.9" "3.10" "3.11" "3.12")
 
-# Build wheel for Python 3.11.
-export PY_BIN="python3.11"
-export PY_TAG="cp311-cp311"
-${OSX_DIR}/build_python_wheel.sh
+for PYTHON_VERSION in ${SUPPORTED_PYTHON_VERSIONS[@]}; do
+    echo "Build wheel for Python ${PYTHON_VERSION}"
+    export PY_BIN=$PYTHON_VERSION
+    export PY_TAG="cp${PYTHON_VERSION//.}-cp${PYTHON_VERSION//.}"
+    ${OSX_DIR}/build_python_wheel.sh
+done
 
 # Clean up.
 rm -fr ${CRC32C_INSTALL_PREFIX}
diff --git a/scripts/osx/build_c_lib.sh b/scripts/osx/build_c_lib.sh
index 6a44322f..99b8bba7 100755
--- a/scripts/osx/build_c_lib.sh
+++ b/scripts/osx/build_c_lib.sh
@@ -54,23 +54,25 @@ ${VENV}/bin/python -m pip install "cmake >= 3.12.0"
 # Build `libcrc32c`
 cd ${REPO_ROOT}/google_crc32c
 mkdir -p build
+cd build
 ls
 
 # We don't build i386 anymore as XCode no longer supports.
 ${VENV}/bin/cmake \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_OSX_DEPLOYMENT_TARGET=10.9 \
-    -DCMAKE_OSX_ARCHITECTURES="x86_64" \
+    -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" \
     -DCRC32C_BUILD_TESTS=no \
     -DCRC32C_BUILD_BENCHMARKS=no \
     -DBUILD_SHARED_LIBS=yes \
     -DCMAKE_INSTALL_PREFIX:PATH=${CRC32C_INSTALL_PREFIX} \
     -DCMAKE_INSTALL_NAME_DIR:PATH=${CRC32C_INSTALL_PREFIX}/lib \
-    .
+    ..
 
 # Install `libcrc32c` into CRC32C_INSTALL_PREFIX.
 make all install
 
 # Clean up.
+cd ..
 rm -fr ${REPO_ROOT}/google_crc32c/build
 rm -fr ${VENV}
diff --git a/scripts/osx/build_gh_action.sh b/scripts/osx/build_gh_action.sh
deleted file mode 100755
index 8b3bc908..00000000
--- a/scripts/osx/build_gh_action.sh
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/bin/bash
-# Copyright 2018 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -e -x
-echo "BUILDING FOR OSX"
-
-# ``readlink -f`` is not our friend on OS X. This relies on **some**
-# ``python`` being installed.
-SCRIPT_FI=$(python -c "import os; print(os.path.realpath('${0}'))")
-OSX_DIR=$(dirname ${SCRIPT_FI})
-SCRIPTS_DIR=$(dirname ${OSX_DIR})
-export REPO_ROOT=$(dirname ${SCRIPTS_DIR})
-
-# Build and install `libcrc32c`
-export PY_BIN="python3"
-export CRC32C_INSTALL_PREFIX="${REPO_ROOT}/usr"
-
-cd ${REPO_ROOT}
-git submodule update --init --recursive
-
-${OSX_DIR}/build_c_lib.sh
-
-# Build wheel
-export PY_BIN="python3"
-export PY_TAG="*"
-${OSX_DIR}/build_python_wheel.sh
-
-
-# Clean up.
-rm -fr ${CRC32C_INSTALL_PREFIX}
diff --git a/scripts/osx/build_python_wheel.sh b/scripts/osx/build_python_wheel.sh
index 8865c771..30648992 100755
--- a/scripts/osx/build_python_wheel.sh
+++ b/scripts/osx/build_python_wheel.sh
@@ -33,9 +33,28 @@ if [[ -z "${PY_TAG}" ]]; then
     exit 1
 fi
 
+# set up pyenv & shell environment for switching across python versions
+eval "$(pyenv init -)"
+eval "$(pyenv init --path)"
+
+install_python_pyenv() {
+    version=$1
+
+    if [ -z "$(pyenv versions --bare | grep $version)" ]; then
+        echo "Python $version is not installed. Installing..."
+        pyenv install $version
+        echo "Python $version installed."
+    else
+        echo "Python $version is already installed."
+    fi
+    pyenv shell $version
+}
+install_python_pyenv ${PY_BIN}
+
 # Create a virtualenv where we can install Python build dependencies.
 VENV=${REPO_ROOT}/venv${PY_BIN}
-${PY_BIN} -m venv ${VENV}
+"python${PY_BIN}" -m venv ${VENV}
+
 curl https://bootstrap.pypa.io/get-pip.py | ${VENV}/bin/python
 ${VENV}/bin/python -m pip install \
     --requirement ${REPO_ROOT}/scripts/dev-requirements.txt
@@ -50,14 +69,23 @@ ${VENV}/bin/python setup.py build_ext \
     --rpath=${REPO_ROOT}/usr/lib
 ${VENV}/bin/python -m pip wheel ${REPO_ROOT} --wheel-dir ${DIST_WHEELS}
 
-# Delocate the wheel. removed --check-archs. We don't build i386.
+# Delocate the wheel.
 FIXED_WHEELS="${REPO_ROOT}/wheels"
 mkdir -p ${FIXED_WHEELS}
 ${VENV}/bin/delocate-wheel \
     --wheel-dir ${FIXED_WHEELS} \
     --verbose \
+    --check-archs \
     ${DIST_WHEELS}/google_crc32c*${PY_TAG}*.whl
 
+# Upload wheels to GCS for debugging. Uncomment only when needed.
+
+export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json
+gcloud auth activate-service-account --key-file=${GOOGLE_APPLICATION_CREDENTIALS}
+ls ${REPO_ROOT}/wheels/
+gsutil cp ${REPO_ROOT}/wheels/* gs://python_crc32c/
+echo "Osx wheels uploaded successfully"
+
 # Clean up.
 rm -fr ${DIST_WHEELS}
 rm -fr ${VENV}
diff --git a/scripts/osx/check.sh b/scripts/osx/check.sh
index 10d7b270..5d31c850 100755
--- a/scripts/osx/check.sh
+++ b/scripts/osx/check.sh
@@ -25,63 +25,39 @@ OSX_DIR=$(dirname ${SCRIPT_FI})
 SCRIPTS_DIR=$(dirname ${OSX_DIR})
 export REPO_ROOT=$(dirname ${SCRIPTS_DIR})
 
+# set up pyenv & shell environment for switching across python versions
+eval "$(pyenv init -)"
+eval "$(pyenv init --path)"
 ls ${REPO_ROOT}/wheels
 
-# NOTE: These are the Python.org versions of Python.
-PYTHON37="/Library/Frameworks/Python.framework/Versions/3.7/bin"
-PYTHON38="/Library/Frameworks/Python.framework/Versions/3.8/bin"
-PYTHON39="/Library/Frameworks/Python.framework/Versions/3.9/bin"
-PYTHON310="/Library/Frameworks/Python.framework/Versions/3.10/bin"
-PYTHON311="/Library/Frameworks/Python.framework/Versions/3.11/bin"
-
-# Make sure we have an updated `pip`.
-curl https://bootstrap.pypa.io/get-pip.py | ${PYTHON37}/python3
-
-# Make sure virtualenv and delocate.
-${PYTHON37}/python3 -m pip install --upgrade delocate
-LISTDEPS_CMD="${PYTHON37}/delocate-listdeps --all --depending"
-VIRTUALENV_CMD="${PYTHON37}/python3 -m venv"
-
-${PYTHON37}/python3 -m venv venv37
-curl https://bootstrap.pypa.io/get-pip.py | venv37/bin/python3
-WHL=${REPO_ROOT}/wheels/google_crc32c-${PACKAGE_VERSION}-cp37-cp37m-macosx_10_9_x86_64.whl
-venv37/bin/pip install ${WHL}
-venv37/bin/pip install pytest
-venv37/bin/py.test ${REPO_ROOT}/tests
-venv37/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
-${LISTDEPS_CMD} ${WHL}
-rm -fr venv37
-
-${PYTHON38}/python3 -m venv venv38
-curl https://bootstrap.pypa.io/get-pip.py | venv38/bin/python3
-WHL=${REPO_ROOT}/wheels/google_crc32c-${PACKAGE_VERSION}-cp38-cp38-macosx_10_9_x86_64.whl
-venv38/bin/pip install ${WHL}
-venv38/bin/pip install pytest
-venv38/bin/py.test ${REPO_ROOT}/tests
-venv38/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
-${LISTDEPS_CMD} ${WHL}
-rm -fr venv38
-
-${PYTHON39}/python3 -m venv venv39
-curl https://bootstrap.pypa.io/get-pip.py | venv39/bin/python3
-WHL=${REPO_ROOT}/wheels/google_crc32c-${PACKAGE_VERSION}-cp39-cp39-macosx_10_9_x86_64.whl
-venv39/bin/pip install ${WHL}
-venv39/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
-${LISTDEPS_CMD} ${WHL}
-rm -fr venv39
-
-${PYTHON310}/python3 -m venv venv310
-curl https://bootstrap.pypa.io/get-pip.py | venv310/bin/python3
-WHL=${REPO_ROOT}/wheels/google_crc32c-${PACKAGE_VERSION}-cp310-cp310-macosx_10_9_x86_64.whl
-venv310/bin/pip install ${WHL}
-venv310/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
-${LISTDEPS_CMD} ${WHL}
-rm -fr venv310
-
-${PYTHON311}/python3 -m venv venv311
-curl https://bootstrap.pypa.io/get-pip.py | venv311/bin/python3
-WHL=${REPO_ROOT}/wheels/google_crc32c-${PACKAGE_VERSION}-cp311-cp311-macosx_10_9_x86_64.whl
-venv311/bin/pip install ${WHL}
-venv311/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
-${LISTDEPS_CMD} ${WHL}
-rm -fr venv311
+SUPPORTED_PYTHON_VERSIONS=("3.8" "3.9" "3.10" "3.11" "3.12")
+
+for PYTHON_VERSION in ${SUPPORTED_PYTHON_VERSIONS[@]}; do
+    PYTHON="python${PYTHON_VERSION}"
+    pyenv shell $PYTHON_VERSION
+    VIRTUALENV="venv${PYTHON_VERSION//.}"
+    # Make sure we have an updated `pip`.
+    curl https://bootstrap.pypa.io/get-pip.py | ${PYTHON}
+    # Make sure virtualenv and delocate.
+    ${PYTHON} -m pip install --upgrade delocate
+    LISTDEPS_CMD="${PYTHON}/delocate-listdeps --all --depending"
+    ${PYTHON} -m venv ${VIRTUALENV}
+
+    OS_VERSION_STR="12_0"
+    if [ "${PYTHON_VERSION}" == "3.12" ]; then
+        OS_VERSION_STR="14.0"
+    fi
+
+    #WHL=${REPO_ROOT}/wheels/google_crc32c-${PACKAGE_VERSION}-cp${PYTHON_VERSION//.}-cp${PYTHON_VERSION//.}-macosx_${OS_VERSION_STR}_x86_64.whl
+    #${VIRTUALENV}/bin/pip install ${WHL} --force-reinstall
+
+    # Alternate method of finding the package that does not verify OS version is as expected
+    ${VIRTUALENV}/bin/pip install --no-index --find-links=${REPO_ROOT}/wheels google-crc32c --force-reinstall
+
+    ${VIRTUALENV}/bin/pip install pytest
+    ${VIRTUALENV}/bin/py.test ${REPO_ROOT}/tests
+    ${VIRTUALENV}/bin/python ${REPO_ROOT}/scripts/check_crc32c_extension.py
+    #${LISTDEPS_CMD} ${WHL}
+    rm -fr ${VIRTUALENV}
+
+done
diff --git a/scripts/windows/build.bat b/scripts/windows/build.bat
index d58b783c..a7b95ed9 100644
--- a/scripts/windows/build.bat
+++ b/scripts/windows/build.bat
@@ -15,40 +15,35 @@
 
 setlocal ENABLEDELAYEDEXPANSION
 
-set CMAKE_GENERATOR="Visual Studio 16 2019"
+set CMAKE_GENERATOR="Visual Studio 17 2022"
 set CONFIGURATION=RelWithDebInfo
 set CRC32C_INSTALL_PREFIX=%cd%\build\%CONFIGURATION%
 
-@rem Path to cmake, env var to make it easier to point to a specific version
-set cmake=cmake
+@rem Iterate through supported Python versions.
+@rem Unfortunately pyenv for Windows has an out-of-date versions list. Choco's
+@rem installer seems to have some problems with installing multiple versions at
+@rem once, so as a workaround, we will install and then uninstall every version.
+FOR %%P IN (3.8, 3.9, 3.10, 3.11, 3.12) DO (
 
-@rem python version should be set as an argument, if not, default to python 3.9
-set PYTHON_VERSION=%1
-if "%PYTHON_VERSION%"=="" (
-  echo "Python version was not provided, using Python 3.9"
-  set PYTHON_VERSION=3.9
+    echo "Installing Python version %%P"
+    choco install python --version=%%P -y --no-progress
 
-)
-
-if "%PYTHON_VERSION%"=="3.10-dev" (
-   set PYTHON_VERSION=3.10
-)
+    echo "Listing available Python versions'
+    py -0
 
-py -0
-py -%PYTHON_VERSION% -m pip install cmake
+    py -%%P-64 -m pip install --upgrade pip
 
-git submodule update --init --recursive
+    echo "Installing cmake for Python %%P"
+    py -%%P-64 -m pip install cmake
 
-FOR %%V IN (32,64) DO (
-    set TARGET_PLATFORM="x64"
-
-    if "%%V"=="32" (
-        set TARGET_PLATFORM="Win32"
-    )
-    echo "Target Platform: !TARGET_PLATFORM!"
+    @rem Add directory as safe to avoid "detected dubious ownership" fatal issue
+    git config --global --add safe.directory %cd%
+    git config --global --add safe.directory C:/tmpfs/src/github/python-crc32c
+    git submodule update --init --recursive
 
+    git config --global --add safe.directory %cd%\google_crc32c
+    git config --global --add safe.directory C:/tmpfs/src/github/python-crc32c/google_crc32c
     pushd google_crc32c
-
     @rem reset hard to cleanup any changes done by a previous build.
     git reset --hard
     git clean -fxd
@@ -59,11 +54,11 @@ FOR %%V IN (32,64) DO (
     mkdir build
     cd build
 
-    echo "Running cmake with Generator:  %CMAKE_GENERATOR%, Platform: !TARGET_PLATFORM!, Install Prefix: %CRC32C_INSTALL_PREFIX%"
+    echo "Running cmake with Generator:  %CMAKE_GENERATOR%, Platform: x64, Install Prefix: %CRC32C_INSTALL_PREFIX%"
 
-    %cmake% -G %CMAKE_GENERATOR% -A !TARGET_PLATFORM! -DCMAKE_BUILD_TYPE=Release -DCRC32C_BUILD_BENCHMARKS=no -DCRC32C_BUILD_TESTS=no -DBUILD_SHARED_LIBS=yes -DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=yes -DCRC32C_USE_GLOG=0 -DCMAKE_INSTALL_PREFIX:PATH=%CRC32C_INSTALL_PREFIX% ..
+    py -%%P-64 -m cmake -G %CMAKE_GENERATOR% -A x64 -DCRC32C_BUILD_BENCHMARKS=no -DCRC32C_BUILD_TESTS=no -DBUILD_SHARED_LIBS=yes -DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=yes -DCRC32C_USE_GLOG=0 -DCMAKE_INSTALL_PREFIX:PATH=%CRC32C_INSTALL_PREFIX% ..
 
-    %cmake% --build . --config "%CONFIGURATION%" --target install
+    py -%%P-64 -m cmake --build . --config "%CONFIGURATION%" --target install
 
     dir %CRC32C_INSTALL_PREFIX% /b /s
     popd
@@ -72,9 +67,26 @@ FOR %%V IN (32,64) DO (
     echo "Copying Binary to root: %CRC32C_INSTALL_PREFIX%\bin\crc32c.dll"
     copy %CRC32C_INSTALL_PREFIX%\bin\crc32c.dll .
 
-    py -%PYTHON_VERSION%-%%V -m pip install --upgrade pip setuptools wheel
+    py -%%P-64 -m pip install --upgrade pip setuptools wheel
     echo "Building C extension"
-    py -%PYTHON_VERSION%-%%V setup.py build_ext --include-dirs=%CRC32C_INSTALL_PREFIX%\include --library-dirs=%CRC32C_INSTALL_PREFIX%\lib
+    py -%%P-64 setup.py build_ext -v --include-dirs=%CRC32C_INSTALL_PREFIX%\include --library-dirs=%CRC32C_INSTALL_PREFIX%\lib
     echo "Building Wheel"
-    py -%PYTHON_VERSION%-%%V -m pip wheel . --wheel-dir wheels/
+    py -%%P-64 -m pip wheel . --wheel-dir wheels/
+
+    echo "Built wheel, now running tests."
+    call %~dp0/test.bat %%P
+
+    echo "Finished with Python version %%P, now uninstalling"
+    choco uninstall python -y
 )
+
+echo "Windows build has completed successfully"
+
+@REM Upload wheels to GCS for testing. Uncomment only when needed.
+
+set "GOOGLE_APPLICATION_CREDENTIALS=%KOKORO_GFILE_DIR%\service-account.json"
+dir "%cd%\wheels"
+call gcloud auth activate-service-account --key-file=%GOOGLE_APPLICATION_CREDENTIALS%
+echo "Windows wheels uploading ..."
+gsutil cp "%cd%\wheels\*" gs://python_crc32c/
+echo "Windows wheels uploaded successfully"
diff --git a/scripts/windows/test.bat b/scripts/windows/test.bat
index dc169a5c..5e9d1280 100644
--- a/scripts/windows/test.bat
+++ b/scripts/windows/test.bat
@@ -12,20 +12,18 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 
-@rem python version should be set as an argument, if not, default to python 3.9
+@rem This test file runs for one Python version at a time, and is intended to
+@rem be called from within the build loop.
+
 set PYTHON_VERSION=%1
 if "%PYTHON_VERSION%"=="" (
-  echo "Python version was not provided, using Python 3.9"
-  set PYTHON_VERSION=3.9
+  echo "Python version was not provided, using Python 3.10"
+  set PYTHON_VERSION=3.10
 )
 
-@rem update python deps and build wheels (requires CRC32C_INSTALL_PREFIX is set)
-@REM FOR %%V IN (3.9-64,3.9-32) DO (
-FOR %%V IN (%PYTHON_VERSION%-32, %PYTHON_VERSION%-64) DO (
-    py -%%V -m pip install --no-index --find-links=wheels google-crc32c --force-reinstall
+py -%PYTHON_VERSION%-64 -m pip install --no-index --find-links=wheels google-crc32c --force-reinstall
 
-    py -%%V ./scripts/check_crc32c_extension.py
+py -%PYTHON_VERSION%-64 ./scripts/check_crc32c_extension.py
 
-    py -%%V -m pip install pytest
-    py -%%V -m pytest tests
-)
+py -%PYTHON_VERSION%-64 -m pip install pytest
+py -%PYTHON_VERSION%-64 -m pytest tests
diff --git a/setup.cfg b/setup.cfg
index 65bc8dfe..aa2a1e31 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -14,7 +14,7 @@
 
 [metadata]
 name = google-crc32c
-version = 1.5.0
+version = 1.6.0.dev1
 description = A python wrapper of the C library 'Google CRC32C'
 url = https://github.com/googleapis/python-crc32c
 long_description = file: README.md
diff --git a/setup.py b/setup.py
index 4bb2aeca..5c304b20 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,6 @@
 
 
 def copy_dll(build_lib):
-    return #  trying static build of C library.
     install_prefix = os.environ.get("CRC32C_INSTALL_PREFIX")
 
     if os.name == "nt" and install_prefix is not None:
diff --git a/src/google_crc32c/__config__.py b/src/google_crc32c/__config__.py
index ea220892..93b945bf 100644
--- a/src/google_crc32c/__config__.py
+++ b/src/google_crc32c/__config__.py
@@ -15,7 +15,6 @@
 import os
 import sys
 
-
 def modify_path():
     """Modify the module search path."""
     # Only modify path on Windows.