diff --git a/Project.toml b/Project.toml
index bc56bcc..bb98b96 100644
--- a/Project.toml
+++ b/Project.toml
@@ -18,7 +18,7 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 [compat]
 Aqua = "0.8"
 BandedMatrices = "1"
-CompactBasisFunctions = "0.3"
+CompactBasisFunctions = "0.3, 0.4"
 ContinuumArrays = "0.18, 0.19, 0.20"
 DomainSets = "0.8"
 FFTW = "1"