diff --git a/Project.toml b/Project.toml
index b753c53..69a27b9 100644
--- a/Project.toml
+++ b/Project.toml
@@ -22,7 +22,7 @@ Arpack = "0.5"
 FFTW = "1"
 HDF5 = "0.17"
 ITensorMPS = "0.2"
-ITensors = "0.6"
+ITensors = "0.6, 0.9"
 NDTensors = "0.3"
 Quantics = "0.3"
 QuanticsGrids = "0.7"