diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml
index b46acf1..bf4c6af 100644
--- a/.github/workflows/bench.yml
+++ b/.github/workflows/bench.yml
@@ -36,7 +36,7 @@ jobs:
           git config --global --add safe.directory $GITHUB_WORKSPACE
 
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           persist-credentials: false
 
@@ -46,7 +46,7 @@ jobs:
           ls -lh benches/
 
       - name: Setup rust toolchain, cache and cargo-codspeed binary
-        uses: moonrepo/setup-rust@v1
+        uses: moonrepo/setup-rust@abb2d32350334249b178c401e5ec5836e0cd88d3 # v1
         with:
           channel: stable
           cache: false
@@ -57,7 +57,7 @@ jobs:
         run: cargo codspeed build
 
       - name: Run the benchmarks
-        uses: CodSpeedHQ/action@v4
+        uses: CodSpeedHQ/action@d872884a306dd4853acf0f584f4b706cf0cc72a2 # v4
         with:
           mode: simulation
           run: cargo codspeed run
diff --git a/.github/workflows/conventional-commits.yml b/.github/workflows/conventional-commits.yml
index ee56395..75b9bb6 100644
--- a/.github/workflows/conventional-commits.yml
+++ b/.github/workflows/conventional-commits.yml
@@ -9,6 +9,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: PR Conventional Commit Validation
-        uses: ytanikin/pr-conventional-commits@1.5.1
+        uses: ytanikin/pr-conventional-commits@fda730cb152c05a849d6d84325e50c6182d9d1e9 # 1.5.1
         with:
           task_types: '["feat","fix","docs","test","ci","refactor","perf","chore","revert"]'
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index b82147c..b8c1333 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           persist-credentials: false
 
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           persist-credentials: false
 
@@ -51,13 +51,13 @@ jobs:
     name: Docs should build without warnings
     runs-on: ubuntu-24.04-arm
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
 
-      - uses: Swatinem/rust-cache@v2
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
 
       - name: Test that docs build without warnings
         run: cargo doc --all-features --document-private-items
diff --git a/.github/workflows/python-docs-publish.yml b/.github/workflows/python-docs-publish.yml
index 19170d4..ed7a9db 100644
--- a/.github/workflows/python-docs-publish.yml
+++ b/.github/workflows/python-docs-publish.yml
@@ -20,19 +20,19 @@ jobs:
       run:
         working-directory: python
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         # We need to additionally fetch the gh-pages branch for mike deploy
         with:
           fetch-depth: 0
           submodules: "true"
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
 
-      - uses: Swatinem/rust-cache@v2
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
 
       - name: Install a specific version of uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
           enable-cache: true
           version: "0.5.x"
diff --git a/.github/workflows/python-wheels.yml b/.github/workflows/python-wheels.yml
index 32ed3f4..ab3fb12 100644
--- a/.github/workflows/python-wheels.yml
+++ b/.github/workflows/python-wheels.yml
@@ -34,12 +34,12 @@ jobs:
             target: aarch64
             manylinux: "2_28"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
           enable-cache: true
           version: "0.5.x"
@@ -48,7 +48,7 @@ jobs:
         run: uv python install 3.10 3.13 pypy3.11
 
       - name: Build abi3-py311 wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.13 --features abi3-py311 --features extension-module --manifest-path python/Cargo.toml
@@ -63,7 +63,7 @@ jobs:
             fi
 
       - name: Build version-specific wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.10 -i pypy3.11 --features extension-module --manifest-path python/Cargo.toml
@@ -78,7 +78,7 @@ jobs:
             fi
 
       - name: Upload wheels
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: wheels-linux-${{ matrix.platform.target }}
           path: dist
@@ -93,12 +93,12 @@ jobs:
           - runner: ubuntu-latest
             target: x86
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
           enable-cache: true
           version: "0.5.x"
@@ -107,7 +107,7 @@ jobs:
         run: uv python install 3.10 3.13 pypy3.11
 
       - name: Build abi3-py311 wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.13 --no-default-features --features abi3-py311 --features extension-module --manifest-path python/Cargo.toml
@@ -115,7 +115,7 @@ jobs:
           manylinux: musllinux_1_2
 
       - name: Build version-specific wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.10 -i pypy3.11 --no-default-features --features extension-module --manifest-path python/Cargo.toml
@@ -123,7 +123,7 @@ jobs:
           manylinux: musllinux_1_2
 
       - name: Upload wheels
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: wheels-musllinux-${{ matrix.platform.target }}
           path: dist
@@ -136,14 +136,14 @@ jobs:
           - runner: windows-latest
             target: x64
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
       # There seem to be linking errors on Windows with the uv-provided Python
       # executables, so we use the Python versions provided by github actions
       # for now.
       # Seems to be this question: https://stackoverflow.com/questions/78557803/python-with-rust-cannot-open-input-file-python3-lib
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: 3.13
           architecture: ${{ matrix.platform.target }}
@@ -152,21 +152,21 @@ jobs:
         shell: pwsh
 
       - name: Build abi3-py311 wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.13 --features abi3-py311 --features extension-module --manifest-path python/Cargo.toml
           sccache: "true"
 
       - name: Build version-specific wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.10 --features extension-module --manifest-path python/Cargo.toml
           sccache: "true"
 
       - name: Upload wheels
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: wheels-windows-${{ matrix.platform.target }}
           path: dist
@@ -181,12 +181,12 @@ jobs:
           - runner: macos-15
             target: aarch64
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
           enable-cache: true
           version: "0.5.x"
@@ -195,21 +195,21 @@ jobs:
         run: uv python install 3.10 3.13 pypy3.11
 
       - name: Build abi3-py311 wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.13 --features abi3-py311 --features extension-module --manifest-path python/Cargo.toml
           sccache: "true"
 
       - name: Build version-specific wheels
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist -i 3.10 -i pypy3.11 --features extension-module --manifest-path python/Cargo.toml
           sccache: "true"
 
       - name: Upload wheels
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: wheels-macos-${{ matrix.platform.target }}
           path: dist
@@ -217,11 +217,11 @@ jobs:
   sdist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
       - name: Build sdist
-        uses: PyO3/maturin-action@v1
+        uses: PyO3/maturin-action@04ac600d27cdf7a9a280dadf7147097c42b757ad # v1
         with:
           command: sdist
           args: --out dist --manifest-path python/Cargo.toml
@@ -229,7 +229,7 @@ jobs:
         run: |
           python -m pip install dist/*.tar.gz
       - name: Upload sdist
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: wheels-sdist
           path: dist
@@ -246,14 +246,14 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/')
     needs: [linux, musllinux, windows, macos, sdist]
     steps:
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           pattern: wheels-*
           merge-multiple: true
           path: dist
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: 3.11
 
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # release/v1
diff --git a/.github/workflows/rust-release.yml b/.github/workflows/rust-release.yml
index f12cf49..38c3982 100644
--- a/.github/workflows/rust-release.yml
+++ b/.github/workflows/rust-release.yml
@@ -11,8 +11,8 @@ jobs:
     permissions:
       id-token: write # Required for OIDC token exchange
     steps:
-      - uses: actions/checkout@v6
-      - uses: rust-lang/crates-io-auth-action@v1
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - uses: rust-lang/crates-io-auth-action@b7e9a28eded4986ec6b1fa40eeee8f8f165559ec # v1
         id: auth
       - run: cargo publish
         env:
diff --git a/.github/workflows/test-python.yml b/.github/workflows/test-python.yml
index d76273f..c0ed2ca 100644
--- a/.github/workflows/test-python.yml
+++ b/.github/workflows/test-python.yml
@@ -18,12 +18,12 @@ jobs:
       run:
         working-directory: python
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
 
       - name: Install a specific version of uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
           version: "latest"
 
@@ -33,7 +33,7 @@ jobs:
         run: uv run --group docs mkdocs build --strict
 
       # Use ruff-action so we get annotations in the Github UI
-      - uses: astral-sh/ruff-action@v3
+      - uses: astral-sh/ruff-action@4919ec5cf1f49eff0871dbcea0da843445b837e6 # v3
         with:
           src: "python"
 
@@ -44,14 +44,14 @@ jobs:
       run:
         working-directory: python
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
 
-      - uses: Swatinem/rust-cache@v2
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
 
       - name: "cargo check"
         run: cargo check --all --all-features
@@ -68,20 +68,20 @@ jobs:
       matrix:
         python-version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
 
-      - uses: Swatinem/rust-cache@v2
-      - uses: actions/setup-python@v6
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Install a specific version of uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
           version: "latest"
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 76d25e1..7bceb1c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,14 +15,14 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           submodules: "recursive"
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
 
-      - uses: Swatinem/rust-cache@v2
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
 
       - run: cargo install cargo-all-features