diff --git a/docs/Project.toml b/docs/Project.toml
index 4244300..03ab265 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -15,7 +15,7 @@ SciMLBase = "0bca4576-84f4-4d90-8ffe-ffa030f20462"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
 [compat]
-CTBase = "0.25"
+CTBase = "0.25, 0.18"
 CTModels = "0.13"
 CTSolvers = "0.4"
 DiffEqBase = "7"