diff --git a/Project.toml b/Project.toml
index 22fe3200e3..ddc19cb8df 100644
--- a/Project.toml
+++ b/Project.toml
@@ -57,6 +57,7 @@ KrylovKit = "0.4.2, 0.5, 0.6, 0.7"
 LinearAlgebra = "1.6"
 LinearMaps = "3"
 NDTensors = "0.3.0"
+Observers = "0.2"
 PackageCompiler = "1, 2"
 PackageExtensionCompat = "1"
 Pkg = "1.6"