diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index a46faa0..c491931 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -18,6 +18,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      - with:
+          # Whether to checkout submodules: `true` to checkout submodules or `recursive` to
+          # recursively checkout submodules.
+          submodules: 'true'
+          lfs: 'true'
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
diff --git a/setup.py b/setup.py
index 917a014..ec4d2d9 100644
--- a/setup.py
+++ b/setup.py
@@ -119,7 +119,7 @@ setup(
     package_dir={'': '.'},
     package_data={'': ['py.typed'] + stubs},
     include_package_data=True,
-    install_requires=["Pillow", "click"],
+    install_requires=["ninja", "Pillow", "click"],
     extras_require={
         "tests": ["nose", "parameterized"],
         "docs": ["sphinx", "myst-parser", "sphinx-rtd-theme"],
diff --git a/tests/images b/tests/images
index dd5ebb7..0ade526 160000
--- a/tests/images
+++ b/tests/images
@@ -1 +1 @@
-Subproject commit dd5ebb79412f097a80391ab9975f611cbb85d0e1
+Subproject commit 0ade526dd1070e6f5b43e0bd58b26828abff86b7