diff --git a/Project.toml b/Project.toml
index 86385cf..98487b0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -47,7 +47,7 @@ PythonPlot = "1"
 Unitful = "1"
 UnitfulAngles = "0.6"
 UnitfulAstro = "1"
-VLBISkyModels = "0.2"
+VLBISkyModels = "0.2, 0.4"
 julia = "1.8.5"
 
 [extras]