diff --git a/packages/kernel/py/stlite-server/poetry.lock b/packages/kernel/py/stlite-server/poetry.lock
index 582824e65..035b8c1c2 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"
 files = [
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+    {file = "matplotlib-3.9.1-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:f1f2e5d29e9435c97ad4c36fb6668e89aee13d48c75893e25cef064675038ac9"},
+    {file = "matplotlib-3.9.1.tar.gz", hash = "sha256:de06b19b8db95dd33d0dc17c926c7c9ebed9f572074b6fac4f65068a6814d010"},
 ]
 
 [package.dependencies]
@@ -1613,4 +1613,4 @@ watchmedo = ["PyYAML (>=3.10)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "cb2a42f54ef0946afe917220b7c9ac51bcf47e83557fe230fb2eefa64ceda0c7"
+content-hash = "5280aabe66f624306d16b105a268dd206c16af562c1f6b971e9312ce60127321"
diff --git a/packages/kernel/py/stlite-server/pyproject.toml b/packages/kernel/py/stlite-server/pyproject.toml
index 7b42fe486..7e7e052b3 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 = "^1.10.1"
 streamlit-aggrid = "^1.0.5"
 pandas-stubs = "^2.2.2.240603"
-matplotlib = "^3.9.0"
+matplotlib = "^3.9.1"
 ruff = "^0.5.1"
 
 [build-system]