diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index b6301fd3..df9f27e4 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -15,6 +15,8 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v2
+        with:
+          submodules: 'true'
       - uses: ome/spec-prod@main
         with:
           GH_PAGES_BRANCH: gh-pages
diff --git a/.github/workflows/validation.yml b/.github/workflows/validation.yml
index 32a2d601..81e6b7a5 100644
--- a/.github/workflows/validation.yml
+++ b/.github/workflows/validation.yml
@@ -19,6 +19,8 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
+        with:
+          submodules: 'true'
       - uses: actions/setup-python@v2
         with:
           python-version: '3.9'