diff --git a/.github/workflows/gmgc_finder_test.yml b/.github/workflows/gmgc_finder_test.yml
index 1b1b45f..1c72775 100644
--- a/.github/workflows/gmgc_finder_test.yml
+++ b/.github/workflows/gmgc_finder_test.yml
@@ -18,6 +18,7 @@ jobs:
         pip install numpy
         pip install .
         pip install pytest
+        pip install atomicwrites
     - name: Test with pytest
       run: |
         python -m pytest ./test/test_alignment.py
diff --git a/setup.py b/setup.py
index 6cc8975..fb72d0b 100644
--- a/setup.py
+++ b/setup.py
@@ -40,6 +40,7 @@
           'safeout',
           'tqdm',
           'pyyaml',
+           'atomicwrites',
       ],
       package_data={
              'gmgc_finder': ['*.md']},