diff --git a/Project.toml b/Project.toml
index aa6a804..e27e9bd 100644
--- a/Project.toml
+++ b/Project.toml
@@ -24,7 +24,7 @@ ITensorTDVPObserversExt = "Observers"
 Adapt = "3, 4"
 Compat = "4"
 ITensors = "0.6.10"
-KrylovKit = "0.6, 0.7, 0.8"
+KrylovKit = "0.6, 0.7, 0.8, 0.9"
 NDTensors = "0.3.31"
 Observers = "0.2"
 PackageExtensionCompat = "1"