diff --git a/setup.py b/setup.py
index 49b93d01..42a945fe 100644
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@ setup(
     },
     obsoletes=['atticmatic'],
     install_requires=(
-        'jsonschema',
+        'jsonschema>=3.0.0,<4.0.0',
         'requests',
         'ruamel.yaml>0.15.0,<0.18.0',
         'setuptools',