diff --git a/Project.toml b/Project.toml
index 2aedd48..6fcd59d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -53,7 +53,7 @@ PhyloPlots = "1.0.0"
 Plots = "1.32.0"
 RCall = "0.13.13"
 Shapefile = "0.7.4"
-SimpleSDMLayers = "0.7.0"
+SimpleSDMLayers = "0.7.0, 0.9"
 Unitful = "1.11.0"
 
 [extras]