diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index e7866d8a..043a9778 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -40,9 +40,9 @@ jobs:
     name: Lint & Format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
-      - uses: astral-sh/setup-uv@v7
+      - uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
 
       - name: Ruff check
         run: uvx ruff check crates/bashkit-python
@@ -50,7 +50,7 @@ jobs:
       - name: Ruff format
         run: uvx ruff format --check crates/bashkit-python
 
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: "3.12"
 
@@ -67,16 +67,16 @@ jobs:
       matrix:
         python-version: ["3.9", "3.12", "3.13", "3.14"]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@1.95.0
+        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
 
-      - uses: Swatinem/rust-cache@v2
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
 
       - name: Install maturin
         run: python -m pip install "maturin${MATURIN_VERSION}"
@@ -105,18 +105,18 @@ jobs:
     name: Examples
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: "3.12"
 
-      - uses: astral-sh/setup-uv@v7
+      - uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@1.95.0
+        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
 
-      - uses: Swatinem/rust-cache@v2
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
 
       - name: Install maturin
         run: python -m pip install "maturin${MATURIN_VERSION}"
@@ -157,9 +157,9 @@ jobs:
     name: Build wheel
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: "3.12"
 
@@ -175,7 +175,7 @@ jobs:
           pip install twine
           twine check crates/bashkit-python/dist/*
 
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
           name: python-wheel
           path: crates/bashkit-python/dist
@@ -196,12 +196,12 @@ jobs:
       RUST_NIGHTLY: "nightly-2026-05-29"
       PYODIDE_BUILD_VERSION: "0.34.4"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
       # Python 3.13 selects pyodide-build's modern config (Pyodide 0.29.x,
       # Emscripten 4.0.9), whose binaryen understands the wasm target-features
       # modern LLVM emits and whose runtime supports wasm exception handling.
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: "3.13"
 
@@ -213,12 +213,12 @@ jobs:
       - name: Install nightly Rust with the Emscripten target
         # @nightly matches the repo's other nightly jobs (fuzz.yml, nightly.yml,
         # ci.yml); the exact nightly is pinned via the toolchain: input below.
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@5b842231ba77f5c045dba54ac5560fed2db780e2 # nightly
         with:
           toolchain: ${{ env.RUST_NIGHTLY }}
           targets: wasm32-unknown-emscripten
 
-      - uses: Swatinem/rust-cache@v2
+      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2
 
       # pyodide-build manages its own matching emsdk via the cross-build env, so
       # no separate setup-emsdk step is needed.
@@ -260,7 +260,7 @@ jobs:
           print('wasm smoke test OK')
           "
 
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
           name: python-wheel-emscripten
           path: crates/bashkit-python/dist