diff --git a/docs/Project.toml b/docs/Project.toml
index 5667f86a..776c4d75 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -5,4 +5,4 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 
 [compat]
 AbstractGPs = "0.4, 0.5"
-Documenter = "0.27"
+Documenter = "0.27, 1"