diff --git a/dev-requirements.txt b/dev-requirements.txt
index 50a7a80..524edfc 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -10,23 +10,27 @@ attrs==21.2.0
     # via pytest
 babel==2.9.1
     # via sphinx
-backports.entry-points-selectable==1.1.0
-    # via virtualenv
+cachetools==5.3.0
+    # via tox
 certifi==2021.5.30
     # via requests
+chardet==5.1.0
+    # via tox
 charset-normalizer==2.0.4
     # via requests
+colorama==0.4.6
+    # via tox
 commonmark==0.9.1
     # via recommonmark
 coverage==5.5
     # via pytest-cov
-distlib==0.3.2
+distlib==0.3.6
     # via virtualenv
 docutils==0.17.1
     # via
     #   recommonmark
     #   sphinx
-filelock==3.0.12
+filelock==3.9.0
     # via
     #   tox
     #   virtualenv
@@ -40,26 +44,27 @@ jinja2==3.0.1
     # via sphinx
 markupsafe==2.0.1
     # via jinja2
-packaging==21.0
+packaging==23.0
     # via
+    #   pyproject-api
     #   pytest
     #   setuptools-scm
     #   sphinx
     #   tox
-platformdirs==2.3.0
-    # via virtualenv
-pluggy==1.0.0
+platformdirs==3.0.0
     # via
-    #   pytest
     #   tox
-py==1.10.0
+    #   virtualenv
+pluggy==1.0.0
     # via
     #   pytest
     #   tox
+py==1.10.0
+    # via pytest
 pygments==2.10.0
     # via sphinx
-pyparsing==2.4.7
-    # via packaging
+pyproject-api==1.5.0
+    # via tox
 pytest==6.2.5
     # via
     #   -r dev-requirements.in
@@ -76,11 +81,6 @@ requests==2.26.0
     # via sphinx
 setuptools-scm==6.3.1
     # via -r dev-requirements.in
-six==1.16.0
-    # via
-    #   -c requirements.txt
-    #   tox
-    #   virtualenv
 snowballstemmer==2.1.0
     # via sphinx
 sphinx==4.2.0
@@ -103,14 +103,13 @@ toml==0.10.2
     # via
     #   pytest
     #   pytest-cov
-    #   tox
 tomli==1.2.1
     # via setuptools-scm
-tox==3.24.3
+tox==4.4.5
     # via -r dev-requirements.in
 urllib3==1.26.6
     # via requests
-virtualenv==20.7.2
+virtualenv==20.19.0
     # via tox
 wheel==0.37.0
     # via -r dev-requirements.in