diff --git a/Project.toml b/Project.toml
index 3f26d64..2013ead 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,6 +12,7 @@ SymbolicUtils = "d1185830-fcd6-423d-90d6-eec64667417b"
 [compat]
 ModelingToolkit = "5.6"
 OrdinaryDiffEq = "5.51"
+SymbolicUtils = "0.15"
 julia = "1.5.3"
 
 [extras]