diff --git a/Project.toml b/Project.toml
index d60fa60..09be650 100644
--- a/Project.toml
+++ b/Project.toml
@@ -193,7 +193,7 @@ Tables = "0.2, 1.0"
 ThreadsX = "0.1"
 TransformVariables = "0.6, 0.7, 0.8"
 TreeViews = "0.3"
-Trixi = "0.4, 0.5"
+Trixi = "0.4, 0.5, 0.9"
 Tullio = "0.3"
 UnicodePlots = "3"
 Unitful = "1.0"