diff --git a/poetry.lock b/poetry.lock
index 1c33ae0..1639371 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1337,19 +1337,19 @@ files = [
 
 [[package]]
 name = "graphviz"
-version = "0.20.3"
+version = "0.21"
 description = "Simple Python interface for Graphviz"
 optional = false
-python-versions = ">=3.8"
+python-versions = ">=3.9"
 groups = ["main"]
 files = [
-    {file = "graphviz-0.20.3-py3-none-any.whl", hash = "sha256:81f848f2904515d8cd359cc611faba817598d2feaac4027b266aa3eda7b3dde5"},
-    {file = "graphviz-0.20.3.zip", hash = "sha256:09d6bc81e6a9fa392e7ba52135a9d49f1ed62526f96499325930e87ca1b5925d"},
+    {file = "graphviz-0.21-py3-none-any.whl", hash = "sha256:54f33de9f4f911d7e84e4191749cac8cc5653f815b06738c54db9a15ab8b1e42"},
+    {file = "graphviz-0.21.tar.gz", hash = "sha256:20743e7183be82aaaa8ad6c93f8893c923bd6658a04c32ee115edb3c8a835f78"},
 ]
 
 [package.extras]
-dev = ["flake8", "pep8-naming", "tox (>=3)", "twine", "wheel"]
-docs = ["sphinx (>=5,<7)", "sphinx-autodoc-typehints", "sphinx-rtd-theme"]
+dev = ["Flake8-pyproject", "build", "flake8", "pep8-naming", "tox (>=3)", "twine", "wheel"]
+docs = ["sphinx (>=5,<7)", "sphinx-autodoc-typehints", "sphinx-rtd-theme (>=0.2.5)"]
 test = ["coverage", "pytest (>=7,<8.1)", "pytest-cov", "pytest-mock (>=3)"]
 
 [[package]]
@@ -6052,4 +6052,4 @@ propcache = ">=0.2.1"
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<3.12"
-content-hash = "a85d3c7f3e5861faa7a22f5e0c0348283b69a25ac3c034c01f8aecea6f2ea1ac"
+content-hash = "d5a868119b2c68729ba0315368992c7f0a377c64af44012f01fee013aa8c1799"
diff --git a/pyproject.toml b/pyproject.toml
index aa47ab5..c79dd66 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ pyreadr = "0.5.4" # read R data files
 types-psutil = "6.1.0.20241102" # type hints for psutil
 psutil = "7.2.2" # process and system utilities
 torchview = "0.2.6" # model visualization library
-graphviz = "0.20.3" # graph visualization library
+graphviz = "0.21" # graph visualization library
 matplotlib = "3.10.0" # plotting library
 pillow = "12.1.1" # image processing library
 torchvision ="0.26" # computer vision library