diff --git a/requirements.txt b/requirements.txt
index 24fdbcf..d0fa1a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
-9.1.0
 asn1crypto==0.24.0
 certifi==2019.6.16
 cffi==1.12.3