diff --git a/dev-requirements.in b/dev-requirements.in
index 9134495..1f021ec 100644
--- a/dev-requirements.in
+++ b/dev-requirements.in
@@ -3,7 +3,7 @@ isort
 mypy
 pep8-naming
 Sphinx
-tox
+tox==4.3.5
 # Twine is used for uploading packages to pypi
 # but it induces an install of cryptography
 # This is sucky for rpi systems.
diff --git a/dev-requirements.txt b/dev-requirements.txt
index 3d101e4..d85aacb 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -39,15 +39,15 @@ jsonschema==4.17.3        # via fixit
 libcst==1.0.1             # via fixit
 markupsafe==2.1.3         # via jinja2
 mccabe==0.7.0             # via flake8
-mypy==1.3.0               # via -r dev-requirements.in
+mypy==1.4.0               # via -r dev-requirements.in
 mypy-extensions==1.0.0    # via black, mypy, typing-inspect
 nodeenv==1.8.0            # via pre-commit
 packaging==23.1           # via black, build, pyproject-api, pytest, sphinx, tox
 pathspec==0.11.1          # via black
 pep8-naming==0.13.3       # via -r dev-requirements.in
 pip-tools==6.13.0         # via -r dev-requirements.in
-platformdirs==3.5.3       # via black, tox, virtualenv
-pluggy==1.0.0             # via pytest, tox
+platformdirs==3.7.0       # via black, tox, virtualenv
+pluggy==1.2.0             # via pytest, tox
 pre-commit==3.3.3         # via -r dev-requirements.in
 pycodestyle==2.10.0       # via flake8
 pyflakes==3.0.1           # via autoflake, flake8
@@ -57,7 +57,7 @@ pyproject-hooks==1.0.0    # via build
 pyrsistent==0.19.3        # via jsonschema
 pytest==7.3.2             # via -r dev-requirements.in, pytest-cov
 pytest-cov==4.1.0         # via -r dev-requirements.in
-pyupgrade==3.6.0          # via gray
+pyupgrade==3.7.0          # via gray
 pyyaml==6.0               # via fixit, libcst, pre-commit
 requests==2.31.0          # via sphinx
 rich==12.6.0              # via gray
@@ -72,13 +72,13 @@ sphinxcontrib-serializinghtml==1.1.5  # via sphinx
 tokenize-rt==5.1.0        # via add-trailing-comma, pyupgrade
 toml==0.10.2              # via autoflake
 tomli==2.0.1              # via black, build, coverage, mypy, pyproject-api, pyproject-hooks, pytest, tox
-tox==4.6.0                # via -r dev-requirements.in
+tox==4.3.5                # via -r dev-requirements.in
 typing-extensions==4.6.3  # via libcst, mypy, typing-inspect
 typing-inspect==0.9.0     # via libcst
 unify==0.5                # via gray
 untokenize==0.1.1         # via unify
 urllib3==2.0.3            # via requests
-virtualenv==20.23.0       # via pre-commit, tox
+virtualenv==20.23.1       # via pre-commit, tox
 wheel==0.40.0             # via pip-tools
 
 # The following packages are considered to be unsafe in a requirements file: