diff --git a/poetry.lock b/poetry.lock
index 255a981..58fcecf 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -808,8 +808,9 @@ testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more
 
 [extras]
 notebook = ["nbformat"]
+toml = ["tomli"]
 
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.7,<4.0"
-content-hash = "4eb5cd71ada4e743bf51e23bba01d55143dfd3c8727c03dc7ee8f46c63215324"
+content-hash = "131a1e4dbcdc59b889ad9c54f5030ebc48f83949aaa9c401413e4ac61fd5da57"
diff --git a/pyproject.toml b/pyproject.toml
index a09fe34..302d408 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,6 +17,7 @@ colorama = [
 # A list of all of the optional dependencies, which are included in the
 # below `extras`. They can be opted into by apps.
 # https://python-poetry.org/docs/pyproject/#extras
+tomli = { version = ">=2.0.1", optional = true }
 nbformat = { version = "*",  optional = true }
 
 [tool.poetry.group.dev.dependencies]
@@ -29,6 +30,7 @@ nbformat = "*"
 tox = "^4.4.7"
 
 [tool.poetry.extras]
+toml = ["tomli"]
 notebook = ["nbformat"]
 
 [tool.poetry.scripts]