diff --git a/Project.toml b/Project.toml
index 9a02a1f..6fbc85c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -17,7 +17,7 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 EzXML = "1.1"
 MathML = "0.1.9"
 Memoize = "0.4"
-ModelingToolkit = "6, 7"
+ModelingToolkit = "7"
 Setfield = "0.7"
 SymbolicUtils = "0.16, 0.18"
 julia = "1.6"