diff --git a/requirements.txt b/requirements.txt
index 8cdaa36..7507f13 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 appdirs==1.4.3
+asn1crypto==0.24.0
 backports.functools-lru-cache==1.5
 BTrees==4.5.1
 certifi==2019.3.9
@@ -6,6 +7,7 @@ cffi==1.12.3
 chardet==3.0.4
 cheroot==6.5.5
 CherryPy==18.1.1
+cryptography==2.7
 idna==2.8
 jaraco.functools==2.0
 more-itertools==7.0.0