diff --git a/docs/Project.toml b/docs/Project.toml
index a4792157b..95c354e1b 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -8,7 +8,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
 Distances = "0.10"
-Documenter = "0.27"
+Documenter = "0.27, 1"
 KernelFunctions = "0.10"
 Kronecker = "0.4, 0.5"
 PDMats = "0.11"