diff --git a/docs/Project.toml b/docs/Project.toml
index 829c39af3..f51f69ce3 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -3,4 +3,4 @@ Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 JuDocTemplates = "6793090a-55ae-11e9-0511-73b91164f4ea"
 
 [compat]
-Documenter = "^0.23"
+Documenter = "~0.22"