diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7ab3f9f..5189194 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -49,7 +49,7 @@ jobs:
         run: sudo apt-get install pandoc
 
       - name: Install Tox
-        run: pip install tox
+        run: pip install 'tox < 4.0'
 
       - name: Run Commands
         run: ${{ matrix.commands }}
diff --git a/setup.py b/setup.py
index a8037dd..e992031 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ def get_version(filename):
 
 # requirements for development (testing, generating docs)
 dev_requirements = [
-    'black',
+    'black < 23.0',
     'coverage',
     'coveralls',
     'flake8',
diff --git a/tox.ini b/tox.ini
index cb34169..9b29582 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,7 @@
 [tox]
 minversion = 3.14
+requires =
+    tox<4
 envlist = py37-{test,runcmd}, py38-{test,runcmd}, py39-{test,runcmd}, py310-{test,runcmd}, py311-{test,runcmd}, run-{cmd,blackcheck,black,isort,isortcheck}, docs, coverage
 
 [testenv:.tox]