diff --git a/docs/Project.toml b/docs/Project.toml
index 40fcb16581..9f39af4dc8 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -26,6 +26,7 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 [compat]
 BenchmarkTools = "1.3"
 BifurcationKit = "0.4"
+ControlSystemsBase = "1"
 DataInterpolations = "6.5"
 Distributions = "0.25"
 Documenter = "1"