diff --git a/tox.ini b/tox.ini
index b3f5a754..c82863ce 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ extras = tweedledum
 deps = 
     sympy
     numpy
-    matplotlib==3.8.4
+    matplotlib==3.7.5
     qiskit
     qiskit-aer
     cirq