diff --git a/requirements.txt b/requirements.txt
index 71a58a4..908b66a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,6 @@ requests==2.13.0
 cffi==1.10.0
 cryptography==2.0.3
 idna==2.5
-pyasn1==0.2.3
+pyasn1==0.4.4
 pycparser==2.17
 six==1.10.0