diff --git a/Project.toml b/Project.toml
index 28657c0..00119d3 100644
--- a/Project.toml
+++ b/Project.toml
@@ -61,6 +61,7 @@ MD5 = "0.2"
 Missings = "0.4"
 MultivariateStats = "0.8"
 Plots = "1"
+QuadGK = "2"
 Query = "1"
 RvSpectML = ">=0.2.3"
 RvSpectMLBase = ">=0.2.1"