diff --git a/requirements.txt b/requirements.txt
index ee73d0c3..4eba1ca4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ dict.sorted
 dogpile.cache
 fedmsg
 funcsigs
-jsonschema
+jsonschema < 4.0.0
 kobo
 koji
 lxml