diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f5e11f3..9f7a53c 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -26,6 +26,8 @@ jobs:
         target: [x86_64, x86, aarch64, armv7, s390x, ppc64le]
     steps:
       - uses: actions/checkout@v3
+        with:
+          submodules: 'true'
       - uses: actions/setup-python@v4
         with:
           python-version: '3.10'
@@ -49,6 +51,8 @@ jobs:
         target: [x64, x86]
     steps:
       - uses: actions/checkout@v3
+        with:
+          submodules: 'true'
       - uses: actions/setup-python@v4
         with:
           python-version: '3.10'
@@ -72,6 +76,8 @@ jobs:
         target: [x86_64, aarch64]
     steps:
       - uses: actions/checkout@v3
+        with:
+          submodules: 'true'
       - uses: actions/setup-python@v4
         with:
           python-version: '3.10'
@@ -91,6 +97,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+        with:
+          submodules: 'true'
       - name: Build sdist
         uses: PyO3/maturin-action@v1
         with: