diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 1acccfc..bdbceef 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -44,8 +44,10 @@ jobs:
     name: "${{ matrix.distro }}${{ matrix.env.NAME && ' • ' || ''}}${{ matrix.env.NAME }}${{ matrix.env.CLANG_TIDY && ' • clang-tidy' || '' }}"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-
+      - uses: actions/checkout@v5
+        with:
+          submodules: recursive
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
       - name: Cache ccache
         uses: rhaschke/cache@main
         with:
diff --git a/.github/workflows/format.yaml b/.github/workflows/format.yaml
index 12e0114..b39d974 100644
--- a/.github/workflows/format.yaml
+++ b/.github/workflows/format.yaml
@@ -13,8 +13,9 @@ jobs:
     name: pre-commit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
           submodules: recursive
       - name: Install clang-format
         run: sudo apt-get install clang-format
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..66508ea
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "pybind11"]
+	path = pybind11
+	url = git@github.com:PickNikRobotics/pybind11.git
diff --git a/pybind11 b/pybind11
new file mode 160000
index 0000000..dad2380
--- /dev/null
+++ b/pybind11
@@ -0,0 +1 @@
+Subproject commit dad2380fe9a9bdc54b46b1b35188cd1e7d8a9ee8