diff --git a/docs/Project.toml b/docs/Project.toml
index adc9a2d9..51199656 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -7,7 +7,7 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
-Documenter = "0.27"
+Documenter = "0.27, 1"
 EvoTrees = "0.14.7, 0.15, 0.16"
 MLJBase = "0.19, 0.20, 0.21"
 MLJIteration = "0.5"