diff --git a/docs/Project.toml b/docs/Project.toml
index c9f38ad..ef04112 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -15,5 +15,6 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [compat]
+ADTypes = "1.21.0"
 Documenter = "1.3"
 Literate = "2.21.0"