diff --git a/Project.toml b/Project.toml
index 2fcc013f91..59e979a330 100644
--- a/Project.toml
+++ b/Project.toml
@@ -41,7 +41,7 @@ RecursiveArrayTools = "2.3"
 SafeTestsets = "0.0.1"
 SpecialFunctions = "0.7, 0.8, 0.9, 0.10"
 StaticArrays = "0.10, 0.11, 0.12"
-SymbolicUtils = "0.3.2"
+SymbolicUtils = "0.3.2, 0.4"
 TreeViews = "0.3"
 UnPack = "0.1, 1.0"
 Unitful = "1.1"