diff --git a/requirements.txt b/requirements.txt
index 64c7c29e..14005439 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-PyYAML>=3.0
-click>=6.0
-jsonref>=0.1
-requests>=2.12.0
-jsonschema>=2.5.1
-joblib>=0.11
-cloudpickle>=0.2
-tenacity>=6.2
+PyYAML>=3.0,<7
+click>=6.0,<7
+jsonref>=0.1,<2
+requests>=2.12.0,<3
+jsonschema>=2.5.1,<5
+joblib>=0.11,<1.3.0
+cloudpickle>=0.2,<3
+tenacity>=6.2,<9