diff --git a/tox.ini b/tox.ini
index 8cbfde70..b3f5a754 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ extras = tweedledum
 deps = 
     sympy
     numpy
-    matplotlib
+    matplotlib==3.8.4
     qiskit
     qiskit-aer
     cirq
@@ -21,8 +21,8 @@ deps =
     pandas
     tweedledum
     pyqubo
-    pennylane==0.33.1 
-    pennylane-lightning==0.33.1
+    pennylane==0.35.1 
+    pennylane-lightning==0.35.1
 
 commands =
     python -I -m build --wheel -C=--build-option=-- -C=--build-option=-- -C=--build-option=-j4
diff --git a/tox_no_tweedledum.ini b/tox_no_tweedledum.ini
index 742d0880..aa4ca151 100644
--- a/tox_no_tweedledum.ini
+++ b/tox_no_tweedledum.ini
@@ -22,8 +22,8 @@ deps =
     qiskit-qrack-provider 
     pandas
     pyqubo
-    pennylane==0.33.1 
-    pennylane-lightning==0.33.1
+    pennylane==0.35.1 
+    pennylane-lightning==0.35.1
 
 ; tweedledum