diff --git a/docs/Project.toml b/docs/Project.toml
index e38c82671..b7eab21e0 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -11,7 +11,7 @@ Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 [compat]
 ControlSystemsBase = "1.1"
 DifferentialEquations = "7.6"
-Documenter = "0.27"
+Documenter = "0.27, 1"
 IfElse = "0.1"
 ModelingToolkit = "8.67"
 ModelingToolkitStandardLibrary = "2"