diff --git a/Project.toml b/Project.toml
index c4a7577..76e935b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -44,6 +44,7 @@ BlockBandedMatrices = "0.13"
 CircularArrays = "1"
 ClassicalOrthogonalPolynomials = "0.13"
 Infinities = "0.1"
+IntervalSets = "0.7"
 QuasiArrays = "0.11"
 julia = "1"