diff --git a/requirements.txt b/requirements.txt
index 2819acf48df3bd67aa1b94491c2a6739bd827f13..6910f6e9ce2d9f7404dd14448db296b59db445f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -72,7 +72,7 @@ pyasn1==0.4.8
     #   rsa
 pyasn1-modules==0.2.8
     # via google-auth
-pycparser==2.20
+pycparser==2.21
     # via cffi
 pynacl==1.4.0
     # via paramiko