diff --git a/setup.py b/setup.py
index 708b028..d89ee65 100644
--- a/setup.py
+++ b/setup.py
@@ -36,6 +36,8 @@ def read(fname, base_url, base_image_url):
         'ics>=0.6',
         'requests',
         'freezegun',
+        'pycryptodomex',
+        'PyNaCl',
     ],
     long_description=read('README.md', __github_url__, __github_assets_absolute_url__),
     long_description_content_type='text/markdown',