diff --git a/pyproject.toml b/pyproject.toml
index 797ec42d..41a94e5f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,7 @@ strict = [
     "FireWorks==2.0.3",
     "PyYAML==6.0.1",
     "maggma==0.69.0",
-    "matplotlib==3.9.0",
+    "matplotlib==3.9.1",
     "monty==2024.5.24",
     "moto==4.2.13",
     "networkx==3.2.1",