diff --git a/docs/Project.toml b/docs/Project.toml
index e39adbd83..f065d632d 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -70,5 +70,5 @@ SciMLBase = "2"
 SciMLOperators = "0.3"
 StaticArrays = "1"
 Sundials = "4.11.3"
-Symbolics = "4, 5"
+Symbolics = "4, 5, 6"
 Unitful = "1"