diff --git a/Project.toml b/Project.toml
index 0cddebe..e977583 100644
--- a/Project.toml
+++ b/Project.toml
@@ -50,6 +50,7 @@ SunAsAStar = "1bd1a468-645d-4223-8813-48273918c0e0"
 TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 
 [compat]
+BandedMatrices = "1"
 CSV = "0.7, 0.8, 0.9.11, 0.10"
 DataFrames = "0.20, 0.21, 0.22, 0.23, 0.24, 1, 1.1"
 EchelleCCFs = ">=0.2.8"