diff --git a/requirements.txt b/requirements.txt
index aee8d8f..207df21 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ lxml==4.4.1
 nltk==3.4.5
 paramiko==2.6.0
 pprint==0.1
-pycparser==2.19
+pycparser==2.21
 PyNaCl==1.3.0
 python-dateutil==2.8.0
 python-dotenv==0.10.3