diff --git a/README.md b/README.md
index 93e85cd9..1c9cc1bf 100644
--- a/README.md
+++ b/README.md
@@ -53,10 +53,10 @@ py-trees-demo-blackboard-remappings       py-trees-demo-eternal-guard
 
 # Run the Formatter, Tests, Linters and Mypy
 (docker) zen@py_trees:/workspaces/py_trees$ poetry run tox -l
-py38 py310 format check mypy38 mypy310
+py310 py312 format check mypy310 mypy312
 (docker) zen@py_trees:/workspaces/py_trees$ poetry run tox -e format
 ...
-(docker) zen@py_trees:/workspaces/py_trees$ poetry run tox -e py38
+(docker) zen@py_trees:/workspaces/py_trees$ poetry run tox -e py310
 ...
 (docker) zen@py_trees:/workspaces/py_trees$ poetry run tox -e check
 ...
diff --git a/tests/__init__.py b/tests/__init__.py
index 2d7ab53a..2ec253f3 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -3,7 +3,6 @@
 
 
 class ImportTest(unittest.TestCase):
-
     def test_import(self):
         """
         This test serves to make the buildfarm happy in Python 3.12 and later.
diff --git a/tox.ini b/tox.ini
index 0b010a79..10d8a8a1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ source_locations =
 #    doc/examples
 
 [tox]
-envlist = py38, py310, format, check, mypy38, mypy310
+envlist = py310, py312, format, check, mypy310, mypy312
 
 ################################################################################
 # PyTest
@@ -74,7 +74,7 @@ commands =
 # Jamming docstrings into a single line looks cluttered.
 #
 #   D200 One-line docstring should fit on one line with quotes
-#
+#f
 # Weakly prefer breaking before a binary operator, so suppress that warning.
 # See https://github.com/python/peps/commit/c59c4376ad233a62ca4b3a6060c81368bd21e85b
 #
@@ -119,20 +119,20 @@ ignore = C901, D105, D107, W503
 # Mypy
 ################################################################################
 
-[testenv:mypy38]
+[testenv:mypy10]
 skip_install = true
-description = Static type checking against python 3.8.
+description = Static type checking against python 3.10.
 locked_deps =
     mypy
     pytest
 commands =
-    mypy --config-file {toxinidir}/tox.ini --python-version 3.8 {[constants]source_locations}
+    mypy --config-file {toxinidir}/tox.ini --python-version 3.10 {[constants]source_locations}
 
-[testenv:mypy310]
+[testenv:mypy312]
 skip_install = true
-description = Static type checking against python 3.10.
+description = Static type checking against python 3.12.
 commands =
-    mypy --config-file {toxinidir}/tox.ini --python-version 3.10 {[constants]source_locations}
+    mypy --config-file {toxinidir}/tox.ini --python-version 3.12 {[constants]source_locations}
 locked_deps =
     mypy
     pytest