diff --git a/.github/workflows/CI-wheels.yaml b/.github/workflows/CI-wheels.yaml
index 469fe0a..8d01c88 100644
--- a/.github/workflows/CI-wheels.yaml
+++ b/.github/workflows/CI-wheels.yaml
@@ -7,7 +7,7 @@ on:
       - main
 
 env:
-  LIBZIM_DL_VERSION: "9.4.0-1"
+  LIBZIM_DL_VERSION: "9.5.1"
   MACOSX_DEPLOYMENT_TARGET: "13.0"
   CIBW_ENVIRONMENT_PASS_LINUX: "LIBZIM_DL_VERSION"
   CIBW_BUILD_VERBOSITY: "3"
@@ -22,18 +22,18 @@ jobs:
         os: [macos-14, windows-2022, ubuntu-24.04]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up QEMU
         if: runner.os == 'Linux'
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
         with:
           platforms: all
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v3.2
+        uses: pypa/cibuildwheel@v3.4
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v7
         with:
           name: wheels-${{ matrix.os }}
           path: ./wheelhouse/*.whl
@@ -42,12 +42,12 @@ jobs:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Build sdist
         run: pipx run build --sdist
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v7
         with:
           name: sdist
           path: dist/*.tar.gz
diff --git a/.github/workflows/Publish.yaml b/.github/workflows/Publish.yaml
index 6fe4eb0..268843d 100644
--- a/.github/workflows/Publish.yaml
+++ b/.github/workflows/Publish.yaml
@@ -6,7 +6,7 @@ on:
       - published
 
 env:
-  LIBZIM_DL_VERSION: "9.4.0-1"
+  LIBZIM_DL_VERSION: "9.5.1"
   MACOSX_DEPLOYMENT_TARGET: "13.0"
   CIBW_ENVIRONMENT_PASS_LINUX: "LIBZIM_DL_VERSION"
   # APPLE_SIGNING_KEYCHAIN_PATH set in prepare keychain step
@@ -25,11 +25,11 @@ jobs:
         os: [ubuntu-24.04, macos-14, windows-2022]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up QEMU
         if: runner.os == 'Linux'
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
         with:
           platforms: all
 
@@ -68,7 +68,7 @@ jobs:
           security unlock-keychain -p mysecretpassword ${APPLE_SIGNING_KEYCHAIN_PATH}
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v3.2
+        uses: pypa/cibuildwheel@v3.4
 
       - name: Cleanup Apple Keychain
         if: matrix.os == 'macos-14'
@@ -78,7 +78,7 @@ jobs:
           security delete-keychain ${APPLE_SIGNING_KEYCHAIN_PATH}
           rm -f ${APPLE_SIGNING_KEYCHAIN_PATH}
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v7
         with:
           name: wheels-${{ matrix.os }}
           path: ./wheelhouse/*.whl
@@ -87,12 +87,12 @@ jobs:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Build sdist
         run: pipx run build --sdist
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v7
         with:
           name: sdist
           path: dist/*.tar.gz
@@ -103,19 +103,19 @@ jobs:
     environment: release
     steps:
       # retrieve all artifacts
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v8
         with:
           name: sdist
           path: dist
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v8
         with:
           name: wheels-ubuntu-24.04
           path: dist
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v8
         with:
           name: wheels-macos-14
           path: dist
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v8
         with:
           name: wheels-windows-2022
           path: dist
diff --git a/.github/workflows/QA.yaml b/.github/workflows/QA.yaml
index 6381b96..dfdd382 100644
--- a/.github/workflows/QA.yaml
+++ b/.github/workflows/QA.yaml
@@ -2,14 +2,14 @@ name: QA
 on: [push]
 
 env:
-  LIBZIM_DL_VERSION: "9.4.0-1"
+  LIBZIM_DL_VERSION: "9.5.1"
   MACOSX_DEPLOYMENT_TARGET: "13.0"
 
 jobs:
   lint:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/Tests.yaml b/.github/workflows/Tests.yaml
index 9e1750d..e6d5bf4 100644
--- a/.github/workflows/Tests.yaml
+++ b/.github/workflows/Tests.yaml
@@ -2,7 +2,7 @@ name: Tests
 on: [push]
 
 env:
-  LIBZIM_DL_VERSION: "9.4.0-1"
+  LIBZIM_DL_VERSION: "9.5.1"
   MACOSX_DEPLOYMENT_TARGET: "13.0"
   # we want cython traces for coverage
   PROFILE: "1"
@@ -16,7 +16,7 @@ jobs:
         python: ["3.10", "3.11", "3.12", "3.13", "3.13t", "3.14", "3.14t"]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v6
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae3f0c2..2b524f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,10 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-* fixed broken links in docs
-
 ### Added
-- Added Changelog to docs.
+
+- Added Changelog to docs (#227)
+
+### Changed
+
+- Upgrade to libzim 9.5.1 and upgrade other Python dependencies, especially Cython 3.2.4 (#250)
+
+### Fixed
+
+- Fixed broken links in docs (#246)
 
 ## [3.8.0] - 2025-11-14
 
diff --git a/docs/scripts/generate_api_nav.py b/docs/scripts/generate_api_nav.py
index 54d1af8..affe336 100644
--- a/docs/scripts/generate_api_nav.py
+++ b/docs/scripts/generate_api_nav.py
@@ -47,16 +47,14 @@
 
     # Create a document with mkdocstrings placeholders.
     with mkdocs_gen_files.open(full_doc_path, "w") as fd:
-        fd.write(
-            f"""---
+        fd.write(f"""---
 title: {identifier}
 ---
 
 
 ::: {identifier}
 {module_options}
-"""
-        )
+""")
 
     # Make the edit button on the page link to the source file.
     mkdocs_gen_files.set_edit_path(full_doc_path, Path("..") / path.relative_to(root))
diff --git a/pyproject.toml b/pyproject.toml
index 126da8d..9cb995d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,8 +1,8 @@
 [build-system]
 requires = [
-  "setuptools == 80.9.0",
-  "wheel == 0.45.1",
-  "cython == 3.1.6",
+  "setuptools == 82.0.1",
+  "wheel == 0.46.3",
+  "cython == 3.2.4",
   # https://github.com/pypa/cibuildwheel/blob/v2.22/cibuildwheel/resources/constraints.txt
   "delocate == 0.13.0 ; platform_system=='Windows'",
 ]
@@ -46,46 +46,46 @@ Donate = "https://www.kiwix.org/en/support-us/"
 
 [project.optional-dependencies]
 scripts = [
-  "invoke==2.2.0",
+  "invoke==2.2.1",
 ]
 lint = [
-  "black==25.9.0",
-  "ruff==0.14.3",
+  "black==26.3.1",
+  "ruff==0.15.7",
   "libzim",
   "libzim[build]",
 ]
 check = [
-  "pyright==1.1.407",
+  "pyright==1.1.408",
   "libzim",
   "libzim[build]",
   "libzim[test]",
   "types-setuptools",
 ]
 test = [
-  "pytest==8.4.2",
-  "coverage==7.11.0",
+  "pytest==9.0.2",
+  "coverage==7.13.5",
   # for cython coverage plugin
   "libzim[build]",
 ]
 build = [
-  "setuptools == 80.9.0",
-  "wheel == 0.45.1",
-  "cython == 3.1.6",
+  "setuptools == 82.0.1",
+  "wheel == 0.46.3",
+  "cython == 3.2.4",
   "delocate == 0.13.0 ; platform_system=='Windows'",
 ]
 docs = [
   "mkdocs==1.6.1",
-  "mkdocstrings-python==1.18.2",
-  "mkdocs-material==9.6.23",
-  "pymdown-extensions==10.16.1",
-  "mkdocs-gen-files==0.5.0",
-  "mkdocs-literate-nav==0.6.2",
-  "mkdocs-include-markdown-plugin==7.2.0",
-  "griffe==1.14.0",
+  "mkdocstrings-python==2.0.3",
+  "mkdocs-material==9.7.6",
+  "pymdown-extensions==10.21",
+  "mkdocs-gen-files==0.6.1",
+  "mkdocs-literate-nav==0.6.3",
+  "mkdocs-include-markdown-plugin==7.2.1",
+  "griffe==2.0.0",
 ]
 dev = [
-  "pre-commit==4.3.0",
-  "ipython==9.6.0",
+  "pre-commit==4.5.1",
+  "ipython==9.11.0",
   "types-setuptools",
   "libzim[scripts]",
   "libzim[lint]",
diff --git a/setup.py b/setup.py
index 0f7426b..4c7c93d 100755
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@
 
 
 class Config:
-    libzim_dl_version: str = os.getenv("LIBZIM_DL_VERSION", "9.4.0-1")
+    libzim_dl_version: str = os.getenv("LIBZIM_DL_VERSION", "9.5.1")
     use_system_libzim: bool = bool(os.getenv("USE_SYSTEM_LIBZIM") or False)
     download_libzim: bool = not bool(os.getenv("DONT_DOWNLOAD_LIBZIM") or False)
 
diff --git a/tests/test_libzim_creator.py b/tests/test_libzim_creator.py
index ef00932..5d63004 100644
--- a/tests/test_libzim_creator.py
+++ b/tests/test_libzim_creator.py
@@ -157,11 +157,7 @@ def get_creator_output(fpath, verbose):
 from libzim.writer import Creator
 with Creator(r"{fpath}").config_verbose({verbose}) as creator:
     pass
-""".replace(
-        "{fpath}", str(fpath)
-    ).replace(
-        "{verbose}", str(verbose)
-    )
+""".replace("{fpath}", str(fpath)).replace("{verbose}", str(verbose))
 
     # Build command with appropriate GIL settings for free-threaded Python
     cmd = [sys.executable]
diff --git a/tests/test_libzim_reader.py b/tests/test_libzim_reader.py
index e8e0bd3..82cc95b 100644
--- a/tests/test_libzim_reader.py
+++ b/tests/test_libzim_reader.py
@@ -627,7 +627,7 @@ def test_reader_get_random_entry(all_zims):
 @pytest.mark.parametrize(*parametrize_for(["filename"]))
 def test_cluster_cache(all_zims, filename):
     zim = Archive(all_zims / filename)
-    default_value = 536870912  # 512M
+    default_value = 16777216  # 16M
     new_value = 1024
 
     assert get_cluster_cache_max_size() == default_value