diff --git a/setup.py b/setup.py
index 448b30b..29a3757 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@
       include_package_data=True,
       zip_safe=True,
       install_requires=[
-        "pymongo",
+        "pymongo[encryption]",
         "pytz",
       ],
       tests_require=[