diff --git a/.github/workflows/linter.yml b/.github/workflows/linter.yml
index 49c0985d..77f4c3b3 100644
--- a/.github/workflows/linter.yml
+++ b/.github/workflows/linter.yml
@@ -39,7 +39,7 @@ jobs:
         uses: snok/install-poetry@v1.3.4
 
       - name: Install tox and mypy
-        run: poetry install --with dev,test,ci
+        run: poetry install --with ci
 
       - name: Run mypy
         run: tox -e mypy
diff --git a/.github/workflows/parallel-support.yml b/.github/workflows/parallel-support.yml
index 4980676e..d83b2b92 100644
--- a/.github/workflows/parallel-support.yml
+++ b/.github/workflows/parallel-support.yml
@@ -63,7 +63,7 @@ jobs:
 
       - name: Install tox
         run: |
-          poetry install --with dev,test,ci
+          poetry install --with ci
 
       - name: Run tox for all environments in parallel
         timeout-minutes: 15
@@ -109,7 +109,7 @@ jobs:
 
       - name: Install tox
         run: |
-          poetry install --with dev,test,ci
+          poetry install --with ci
 
       - name: Run tox for all environments in parallel
         timeout-minutes: 15
diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 3793c0f7..1e21ef23 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -63,7 +63,7 @@ jobs:
 
       - name: Install tox
         run: |
-          poetry install --with dev,test,ci
+          poetry install --with ci
 
       - name: Run tox for "${{ matrix.python-version }}-unit"
         timeout-minutes: 5
@@ -118,7 +118,7 @@ jobs:
 
       - name: Install tox
         run: |
-          poetry install --with dev,test,ci
+          poetry install --with ci
 
       - name: Run tox for "${{ matrix.python-version }}-integration"
         timeout-minutes: 15
@@ -167,7 +167,7 @@ jobs:
 
       - name: Install tox
         run: |
-          poetry install --with dev,test,ci
+          poetry install --with ci
 
       - name: Run tox for "${{ matrix.python-version }}-smoke"
         timeout-minutes: 15
diff --git a/tox.ini b/tox.ini
index 02d3e26e..1e4b1ac2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,4 @@
 [tox]
-isolated_build = true
 requires =
     tox>4
     tox-gh-actions
@@ -28,9 +27,9 @@ setenv =
 commands_pre =
     poetry install --with dev,test
 commands =
-    unit: python3 -m pytest tests/unit/ --maxfail=3 {posargs}
-    integration: python3 -m pytest tests/integration/ --exitfirst --dist=loadscope {posargs}
-    smoke: python3 -m pytest tests/smoke/ --exitfirst --dist=loadscope {posargs}
+    unit: poetry run pytest tests/unit/ --maxfail=3 {posargs}
+    integration: poetry run pytest tests/integration/ --exitfirst --dist=loadscope {posargs}
+    smoke: poetry run pytest tests/smoke/ --exitfirst --dist=loadscope {posargs}
 basepython =
     3.8: py38
     3.9: py39
@@ -50,7 +49,7 @@ setenv =
     PYTHONUNBUFFERED = 1
     PYTHONDONTWRITEBYTECODE = 1
 commands =
-    python3 -m pytest tests --exitfirst \
+    poetry run pytest tests --exitfirst \
     -n auto --dist=loadscope \
     --reruns 5 --rerun-except AssertionError \
     {posargs}
@@ -68,22 +67,22 @@ commands =
 [testenv:mypy]
 commands_pre =
     poetry install --only dev
-    python -m mypy --install-types --non-interactive
+    poetry run mypy --install-types --non-interactive
 commands =
-    python -m mypy --config-file pyproject.toml
+    poetry run mypy --config-file pyproject.toml
 
 [testenv:lint]
 commands_pre =
     poetry install --only dev
 commands =
-    pre-commit {posargs:run --all-files --show-diff-on-failure}
+    poetry run pre-commit {posargs:run --all-files --show-diff-on-failure}
 
 [testenv:clean]
 allowlist_externals = poetry, pytest, bash, find
 commands_pre =
     poetry install --only dev
 commands =
-    python -m cleanpy .
+    poetry run cleanpy .
     bash -c 'files=$(find . -name "*.coverage*" -type f); if [ -n "$files" ]; then echo "Removed coverage file(s):"; echo "$files" | tr " " "\n"; rm $files; fi'
     bash -c 'containers=$(docker ps -aq --filter label=creator=pytest-docker-tools); if [ -n "$containers" ]; then echo "Removed Docker container(s):"; docker rm -f $containers; fi'
     bash -c 'networks=$(docker network ls --filter name=pytest- -q); if [ -n "$networks" ]; then echo "Removed Docker network(s):"; docker network rm $networks; fi'