diff --git a/Project.toml b/Project.toml
index 77f1318..8ffd5be 100644
--- a/Project.toml
+++ b/Project.toml
@@ -22,4 +22,4 @@ Preferences = "1.2.1"
 Reexport = "0.2, 1.0"
 UUIDs = "1"
 julia = "1.10"
-t8code_jll = "=4.0.7"
+t8code_jll = "=4.0.7, 4.0"