diff --git a/docs/Project.toml b/docs/Project.toml
index 45b9e3f..f92ee6a 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -8,3 +8,4 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 [compat]
 Documenter = "1"
 Literate = "2"
+QuantumOperatorDefinitions = "0.1"