diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b9983c2..0ad953d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,6 +18,9 @@ jobs:
     - name: Get cross-platform /dev/null for hidden output
       run: echo "HIDDEN=$(python3 -c "import os; print(os.devnull)")" >> $GITHUB_ENV
 
+    - name: Install pybind11
+      run: git clone --depth 1 --branch v2.13.1 https://github.com/pybind/pybind11.git
+
     - name: Install valgrind
       if: matrix.os == 'ubuntu-latest'
       run: sudo apt-get update && sudo apt-get install -y valgrind