diff --git a/docs/Project.toml b/docs/Project.toml
index 3e66f10..396511f 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -14,7 +14,7 @@ SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 [compat]
 AbstractTrees = "0.3, 0.4"
 DifferentialEquations = "6.15, 7"
-Documenter = "0.27"
+Documenter = "0.27, 1"
 GR = "0.46, 0.72"
 JuMP = "0.2, 1"
 LaTeXStrings = "1.0"