diff --git a/.github/workflows/constraints.txt b/.github/workflows/constraints.txt
index a9bfdd8..aa59c29 100644
--- a/.github/workflows/constraints.txt
+++ b/.github/workflows/constraints.txt
@@ -1,4 +1,4 @@
 pip==21.0.1
 tox==3.20.1
 poetry==1.1.5
-virtualenv==20.0.35
+virtualenv==20.4.3