diff --git a/requirements.txt b/requirements.txt
index 279d521..43fbcb0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ httplib2==0.11.3
 idna==2.7
 oauth2client==4.1.2
 pyasn1==0.4.4
-pyasn1-modules==0.2.2
+pyasn1-modules==0.2.8
 requests==2.19.1
 rsa==3.4.2
 six==1.11.0