diff --git a/Project.toml b/Project.toml
index 2c059527..cab7cc98 100644
--- a/Project.toml
+++ b/Project.toml
@@ -5,6 +5,9 @@ license = "MIT"
 desc = "Basic statistics for Julia."
 version = "1.11.0"
 
+[compat]
+julia = "1.9"
+
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"