diff --git a/Project.toml b/Project.toml
index f70640de..06b43ed8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,8 +20,8 @@ EarthSciData = "a293c155-435f-439d-9c11-a083b6b47337"
 GasChem = "58070593-4751-4c87-a5d1-63807d11d76c"
 
 [extensions]
-GasChemExt = "GasChem"
 EarthSciDataExt = "EarthSciData"
+GasChemExt = "GasChem"
 
 [compat]
 DifferentialEquations = "7"
@@ -31,6 +31,7 @@ IfElse = "0.1"
 ModelingToolkit = "8"
 SafeTestsets = "0.1"
 StaticArrays = "1"
+SymbolicUtils = "3"
 Unitful = "1"
 julia = "1"