diff --git a/.github/workflows/constraints.txt b/.github/workflows/constraints.txt
index a8642e5..cb14b1e 100644
--- a/.github/workflows/constraints.txt
+++ b/.github/workflows/constraints.txt
@@ -2,4 +2,4 @@ pip==25.3
 nox==2025.11.12
 nox-poetry==1.2.0
 poetry==2.2.1
-virtualenv==20.35.4
+virtualenv==21.2.0