diff --git a/ITensorGPU/Project.toml b/ITensorGPU/Project.toml
index 5168dd3a32..6631d16169 100644
--- a/ITensorGPU/Project.toml
+++ b/ITensorGPU/Project.toml
@@ -25,7 +25,7 @@ CUDA = "4.0"
 Combinatorics = "1.0.2"
 Functors = "0.2, 0.3, 0.4"
 HDF5 = "0.15.7, 0.16, 0.17"
-ITensors = "= 0.3.37"
+ITensors = "= 0.3.37, 0.5"
 NDTensors = "0.1.50"
 SimpleTraits = "0.9.4"
 StaticArrays = "1.2.13"