diff --git a/setup.cfg b/setup.cfg
index b9bfe09ad..e04c55208 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -54,7 +54,7 @@ install_requires =
     requests >= 1.0.0
     six
     importlib_resources
-    xmlschema
+    xmlschema >= 1.2.1
 
 
 [options.packages.find]