diff --git a/Project.toml b/Project.toml
index b92d6140..106d4f1a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -15,5 +15,6 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
+AbstractTrees = "0.3"
 ScikitLearnBase = "0.5"
 julia = "1"