diff --git a/pyproject.toml b/pyproject.toml
index 4135efa..57422e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ development = [
   "pytest==8.4.2; python_version <= '3.11'",
   "pytest==9.0.2; python_version > '3.11'",
   "twine==6.2.0",
-  "virtualenv==20.39.0",
+  "virtualenv==21.0.0",
   "wheel==0.46.3",
 ]
 documentation = [