diff --git a/Project.toml b/Project.toml
index c00525eb..a80d27c8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -26,7 +26,7 @@ ChainRulesCore = "1"
 MacroTools = "0.5"
 NNlib = "0.9"
 SpecialFunctions = "2"
-SymbolicUtils = "3"
+SymbolicUtils = "3, 4"
 Symbolics = "6"
 Zygote = "0.6, 0.7"
 julia = "1.10"