diff --git a/packages/kernel/py/stlite-server/poetry.lock b/packages/kernel/py/stlite-server/poetry.lock
index a0e8fccc6..e0f86bf4f 100644
--- a/packages/kernel/py/stlite-server/poetry.lock
+++ b/packages/kernel/py/stlite-server/poetry.lock
@@ -666,40 +666,40 @@ files = [
 
 [[package]]
 name = "matplotlib"
-version = "3.9.0"
+version = "3.9.1"
 description = "Python plotting package"
 optional = false
 python-versions = ">=3.9"
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+    {file = "matplotlib-3.9.1.tar.gz", hash = "sha256:de06b19b8db95dd33d0dc17c926c7c9ebed9f572074b6fac4f65068a6814d010"},
 ]
 
 [package.dependencies]
@@ -1653,4 +1653,4 @@ watchmedo = ["PyYAML (>=3.10)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "ba68d526048de773e671da44a76b8be3290dba5283c7e1deabd4682508679a8d"
+content-hash = "6710a9f45db65efaa0f265268b84a2eb7801f65ad0b553af0725ddc9998f4cd3"
diff --git a/packages/kernel/py/stlite-server/pyproject.toml b/packages/kernel/py/stlite-server/pyproject.toml
index d156ef649..a8f31d7ae 100644
--- a/packages/kernel/py/stlite-server/pyproject.toml
+++ b/packages/kernel/py/stlite-server/pyproject.toml
@@ -14,7 +14,7 @@ requests = "^2.32.3"
 mypy = "^1.11.0"
 streamlit-aggrid = "^1.0.5"
 pandas-stubs = "^2.2.2.240603"
-matplotlib = "^3.9.0"
+matplotlib = "^3.9.1"
 ruff = "^0.5.5"
 pyodide-py = "^0.26.1"
 pyright = "^1.1.373"