diff --git a/requirements.txt b/requirements.txt
index f1ece8ea..94f90f8b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ eth-hash>=0.3.1,<0.8.0
 eth-utils>=2.0.0
 hexbytes<1.3.0
 jinja2>=2.9
-MarkupSafe<2.2.0
+MarkupSafe<3.1.0
 mypy-extensions==1.0.0
 numpy
 persistent>=4.2.0