diff --git a/changelog.d/19081.misc b/changelog.d/19081.misc
new file mode 100644
index 0000000000..8518840fb6
--- /dev/null
+++ b/changelog.d/19081.misc
@@ -0,0 +1 @@
+Update the deprecated poetry development dependencies group name in `pyproject.toml`.
\ No newline at end of file
diff --git a/mypy.ini b/mypy.ini
index ae903f858a..eefe405fe5 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -69,7 +69,7 @@ warn_unused_ignores = False
 ;;     https://github.com/python/typeshed/tree/master/stubs
 ;; and for each package `foo` there's a corresponding `types-foo` package on PyPI,
 ;; which we can pull in as a dev dependency by adding to `pyproject.toml`'s
-;; `[tool.poetry.dev-dependencies]` list.
+;; `[tool.poetry.group.dev.dependencies]` list.
 
 # https://github.com/lepture/authlib/issues/460
 [mypy-authlib.*]
diff --git a/poetry.lock b/poetry.lock
index 1a26e23fad..efbd856b6d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -3293,4 +3293,4 @@ url-preview = ["lxml"]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.9.0"
-content-hash = "0058b93ca13a3f2a0cfc28485ddd8202c42d0015dbaf3b9692e43f37fe2a0be6"
+content-hash = "5d71c862b924bc2af936cb6fef264a023213153543f738af31357deaf6de19b8"
diff --git a/pyproject.toml b/pyproject.toml
index 2b43f182ac..27265357d7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -325,7 +325,7 @@ all = [
     #   - systemd: this is a system-based requirement
 ]
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 # We pin development dependencies in poetry.lock so that our tests don't start
 # failing on new releases. Keeping lower bounds loose here means that dependabot
 # can bump versions without having to update the content-hash in the lockfile.