diff --git a/docs/Project.toml b/docs/Project.toml
index dfa65cd1..2de3b1ac 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -1,2 +1,5 @@
 [deps]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+
+[compat]
+Documenter = "0.27.0"