diff --git a/build/requirements.txt b/build/requirements.txt
index a5b478d..7cb1697 100644
--- a/build/requirements.txt
+++ b/build/requirements.txt
@@ -3,6 +3,7 @@ pylatexenc
 notebook
 purplecaffeine
 prototype-zne
+graphviz
 qiskit==1.0.2
 qiskit[visualization]
 qiskit_aer==0.14.1