diff --git a/Project.toml b/Project.toml
index 4030263641..cee381a164 100644
--- a/Project.toml
+++ b/Project.toml
@@ -47,6 +47,7 @@ KrylovKit = "0.4.2, 0.5, 0.6"
 LinearAlgebra = "1.6"
 LinearMaps = "3"
 NDTensors = "0.2.29"
+Observers = "0.2"
 PackageCompiler = "1.0.0, 2"
 Pkg = "1.6"
 Printf = "1.6"