diff --git a/tox.ini b/tox.ini
index 7f716f5..8aaafee 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,5 +17,6 @@ deps =
     redis==3.4.1
     pytest==3.6.0
     six==1.16.0
+    freezegun==1.2.2
 
 commands = pytest -v tests/test_base.py --cov sentry_telegram_py3 --cov-config .coveragerc --cov-report xml