diff --git a/backend/requirements.txt b/backend/requirements.txt
index f9723b5..a8cb5f6 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -33,7 +33,7 @@ promise==2.3
 psycopg2==2.8.6; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 pyasn1-modules==0.2.8
 pyasn1==0.4.8
-pycparser==2.20; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+pycparser==2.21; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 pyopenssl==20.0.1
 pytz==2021.1
 rx==1.6.1