diff --git a/requirements.txt b/requirements.txt
index aec8429..633e0f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,3 +18,4 @@ redis==3.5.3
 slixmpp==1.6.0
 typing-extensions==3.7.4.3
 yarl==1.6.3
+pytz==2021.3