diff --git a/.bazelignore b/.bazelignore
index 9c6ed551..b4ebeadb 100644
--- a/.bazelignore
+++ b/.bazelignore
@@ -4,3 +4,4 @@ out
 cmake-build-debug
 third_party
 
+.clwb
\ No newline at end of file
diff --git a/.github/workflows/bazel-macos.yml b/.github/workflows/bazel-macos.yml
index 0736d54b..6ebd6119 100644
--- a/.github/workflows/bazel-macos.yml
+++ b/.github/workflows/bazel-macos.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       # This causes build failures
       #      - name: Mount bazel cache  # Optional
diff --git a/.github/workflows/bazel.yml b/.github/workflows/bazel.yml
index 8218b7b0..7e260cc2 100644
--- a/.github/workflows/bazel.yml
+++ b/.github/workflows/bazel.yml
@@ -13,10 +13,17 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Setup bazel
-        uses: bazelbuild/setup-bazelisk@v2
+        uses: bazel-contrib/setup-bazel@0.18.0
+        with:
+          # Avoid downloading Bazel every time.
+          bazelisk-cache: true
+          # Store build cache per workflow.
+          disk-cache: ${{ github.workflow }}
+          # Share repository cache between workflows.
+          repository-cache: true
 
       # This causes build failures
       #      - name: Mount bazel cache  # Optional
diff --git a/.github/workflows/cmake-codecov.yml b/.github/workflows/cmake-codecov.yml
index 6b970aea..2d040780 100644
--- a/.github/workflows/cmake-codecov.yml
+++ b/.github/workflows/cmake-codecov.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
 
       - uses: hendrikmuhs/ccache-action@v1.2
 
@@ -42,8 +42,8 @@ jobs:
         working-directory: ${{github.workspace}}/build
         run: |
           cd test/CMakeFiles/all_tests.dir/
-          lcov --directory . --capture -o coverage.info
-          lcov -r coverage.info */build/* */test/* */c++/* */gtest/* -o coverageFiltered.info
-          lcov --list coverageFiltered.info
+          lcov --directory . --capture -o coverage.info --ignore-errors mismatch
+          lcov -r coverage.info */build/* */test/* */c++/* -o coverageFiltered.info --ignore-errors mismatch
+          lcov --list coverageFiltered.info --ignore-errors mismatch
           bash <(curl -s https://codecov.io/bash) -f coverageFiltered.info || echo "Upload failed"
 
diff --git a/.github/workflows/cmake-macos.yml_fails b/.github/workflows/cmake-macos.yml_fails
index 9cf466cd..87230d2d 100644
--- a/.github/workflows/cmake-macos.yml_fails
+++ b/.github/workflows/cmake-macos.yml_fails
@@ -11,7 +11,7 @@ jobs:
     runs-on: macos-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
 
 #      - uses: hendrikmuhs/ccache-action@v1.2
 
diff --git a/.github/workflows/cmake-windows.yml b/.github/workflows/cmake-windows.yml
index 7cf6c607..e72d9f2e 100644
--- a/.github/workflows/cmake-windows.yml
+++ b/.github/workflows/cmake-windows.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
 
       - uses: hendrikmuhs/ccache-action@v1.2
 
diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index de6e9884..b8d6004c 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
 
       - uses: hendrikmuhs/ccache-action@v1.2
 
diff --git a/.github/workflows/codcecov.yml_old b/.github/workflows/codcecov.yml_old
deleted file mode 100644
index e5eca13a..00000000
--- a/.github/workflows/codcecov.yml_old
+++ /dev/null
@@ -1,42 +0,0 @@
-name: Upload CodeCov Report
-on: [ push ]
-jobs:
-  run:
-    runs-on: windows-latest
-    name: Build, Test , Upload Code Coverage Report
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: ‘2’
-        id: checkout_code
-      - name: Setup MSBuild and add to PATH
-        uses: microsoft/setup-msbuild@v1.0.2
-        id: setup_msbuild
-
-      - name: Generate Solution
-        run: cmake -G "Visual Studio 17 2022" -A x64 . -DPHTREE_CODE_COVERAGE=ON -DCMAKE_BUILD_TYPE=Debug
-
-      - name: Run MSBuild
-        id: run_msbuild
-        run: msbuild /p:Configuration=Debug /p:Platform=x64 /p:gtest_force_shared_crt=on phtree.sln
-      - name: Setup VSTest and add to PATH
-        uses: darenm/Setup-VSTest@v1
-        id: setup_vstest
-
-      - name: Setup OpenCppCoverage and add to PATH
-        id: setup_opencppcoverage
-        run: |
-          choco install OpenCppCoverage -y
-          echo "C:\Program Files\OpenCppCoverage" >> $env:GITHUB_PATH
-
-      - name: Generate Report
-        id: generate_test_report
-        shell: cmd
-        run: OpenCppCoverage.exe --modules phtree --export_type cobertura:phtree.xml -- "vstest.console.exe" test\Debug\all_tests.exe
-      - name: Upload Report to Codecov
-        uses: codecov/codecov-action@v3
-        with:
-          files: ./phtree.xml
-          fail_ci_if_error: true
-          functionalities: fix
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ffb26b27..763e091d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [Unreleased]
 - Nothing yet
 
+### Changed
+- Added support for bazel 8 and 9, thanks to @polasek
+  [#142](https://github.com/tzaeschke/phtree-cpp/issues/142)
+  [#161](https://github.com/tzaeschke/phtree-cpp/pull/161)
+- Updated build files, new Release How-To with support for bazel central registry (BCR)
+  [#163](https://github.com/tzaeschke/phtree-cpp/pull/163)
+
 ## [1.6.2] - 2025-03-08
 ### Fixed
 - Fixed links in CHANGELOG and README. [#152](https://github.com/tzaeschke/phtree-cpp/issues/152)
diff --git a/MODULE.bazel b/MODULE.bazel
index 6609ca3f..4418ca57 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -15,6 +15,7 @@ bazel_dep(name = "google_benchmark", version = "1.9.5")
 
 # Development environment tooling
 http_archive = use_repo_rule("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
 http_file = use_repo_rule("@bazel_tools//tools/build_defs/repo:http.bzl", "http_file")
 
 BUILDIFIER_VERSION = "0.29.0"
diff --git a/ReleaseHowTo.md b/ReleaseHowTo.md
new file mode 100644
index 00000000..5416fb87
--- /dev/null
+++ b/ReleaseHowTo.md
@@ -0,0 +1,89 @@
+
+
+
+
+https://github.com/tzaeschke/phtree-cpp/releases/v1.6.2/download/v1.6.2.tar.gz
+
+
+# Create Release (document WIP)
+
+
+## Verify code
+
+### Run examples
+```shell
+bazel run //examples:example
+```
+
+### Test release with
+- test-phtree-cpp-bazel
+- test-phtree-cpp-cmake
+
+### Compilers
+
+- Test with gcc + clang on Linux
+- Test with VisualStudio on Windows
+- Update references of tested compilers in README.md
+
+## Create Archive
+
+```bash
+git archive --format=zip v1.6.2 > phtree-cpp-v1.6.2.zip
+```
+
+Upload to GitHub release.
+
+Resulting link:
+```
+https://github.com/tzaeschke/phtree-cpp/releases/download/v1.6.2/phtree-cpp-v1.6.2.zip
+```
+
+
+## Bazel Central Repository -- Unfinished documentation
+
+Documentation: 
+https://github.com/bazelbuild/bazel-central-registry/blob/main/docs/README.md
+
+
+PH-Tree build target:
+```
+bazel build //:phtree
+```
+
+#### Start
+
+Checkout personal fork of bazel-central-registry.
+Create branch `phtree-cpp@1.6.2`.
+
+#### After modifying any file
+
+Recreate hashes for `source.json`
+```shell
+bazel run -- //tools:update_integrity phtree-cpp
+```
+ This also accepts `--version` but defaults to latest version.
+
+#### Validate 
+
+```shell
+bazel run -- //tools:bcr_validation --check=phtree-cpp@1.6.2
+```
+
+#### Test locally
+
+```bash
+bazel run //tools:setup_presubmit_repos -- --module phtree-cpp@1.6.2
+```
+
+There is also a GitHub action for release automation:
+https://github.com/bazel-contrib/publish-to-bcr
+
+
+#### Test with Test repos
+
+Check out `test-phtree-cpp-bazel` and run:
+
+```shell
+bazel shutdown && bazel build --enable_bzlmod --registry="file:///home/.../bazel-central-registry" --lockfile_mode=off @phtree-cpp//:phtree-cpp
+--> Target might be incorrect
+```
\ No newline at end of file