diff --git a/Project.toml b/Project.toml
index f92f2dd..207cf96 100644
--- a/Project.toml
+++ b/Project.toml
@@ -23,6 +23,7 @@ FFTW = "1"
 Interpolations = "0.14, 0.15"
 PolynomialRoots = "1"
 PreallocationTools = "0.4"
+QuadGK = "2"
 SpectralDensities = "0.2"
 Statistics = "1"
 julia = "1.7"