diff --git a/pyproject.toml b/pyproject.toml
index 57c16f0e..cd0ae720 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -99,7 +99,7 @@ testing = [
     "ipywidgets>=8",
     "jupytext>=1.11.2,<1.16.0",
     # Matplotlib outputs are sensitive to the matplotlib version
-    "matplotlib==3.7.*",
+    "matplotlib>=3.7,<3.9",
     "nbdime",
     "numpy",
     "pandas",