diff --git a/requirements.txt b/requirements.txt
index af4bf83..ab3adc8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -84,7 +84,7 @@ tornado==5.1.1
 traitlets==4.3.2
 typing==3.6.4
 urllib3==1.23
-virtualenv==16.0.0
+virtualenv==20.36.1
 wcwidth==0.1.7
 webencodings==0.5.1
 Werkzeug==0.14.1