diff --git a/datagen/requirements.txt b/datagen/requirements.txt
index 27697c1..d793007 100644
--- a/datagen/requirements.txt
+++ b/datagen/requirements.txt
@@ -14,7 +14,7 @@ grpc-google-iam-v1==0.11.4
 grpcio==1.21.1
 idna==2.8
 protobuf==3.8.0
-pyasn1==0.4.5
+pyasn1==0.6.4
 pyasn1-modules==0.2.5
 python-dateutil==2.8.0
 pytz==2019.1