diff --git a/requirements.txt b/requirements.txt
index 46c8286..281bedb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 pyopenssl==19.1.0
-pytz==2016.7
+pytz>=2016.7
 signxml==2.8.1
 cryptography==3.3.2
 endesive==2.0.1