diff --git a/pyproject.toml b/pyproject.toml
index 17f03909..6678273e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ dev = [
   "blinker",
   "mongomock-5==5.0.1",  # TEMP
 ]
-legacy = ["MarkupSafe==2.0.1"]
+legacy = ["MarkupSafe==2.1.5"]
 legacy-dev = [
   "pytest",
   "pytest-cov",