diff --git a/poetry.lock b/poetry.lock
index fd7549d..318a625 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -545,7 +545,7 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-MarkupSafe = ">=0.23"
+MarkupSafe = ">=0.23, <=2.0.1"
 
 [package.extras]
 i18n = ["Babel (>=0.8)"]