diff --git a/.github/workflows/libvmaf.yml b/.github/workflows/libvmaf.yml
index be6488d2d..7ac71a45c 100644
--- a/.github/workflows/libvmaf.yml
+++ b/.github/workflows/libvmaf.yml
@@ -78,7 +78,7 @@ jobs:
       - name: Run tox tests
         run: |
           mkdir -p ~/.ccache && sudo chown -R $(whoami) ~/.ccache
-          pip install 'tox<4'
+          pip install tox
           tox -c python/ -e py -- -v -p no:warnings -m 'main or lib' --doctest-modules
 
       - name: Get binary path & Current Release
diff --git a/python/tox.ini b/python/tox.ini
index 0a064f139..4f15faba2 100644
--- a/python/tox.ini
+++ b/python/tox.ini
@@ -3,7 +3,11 @@ envlist = py38, coverage
 
 
 [testenv]
-passenv = APPVEYOR* CI SSL_CERT_FILE TEST_MARKER TRAVIS*
+passenv = APPVEYOR*
+          CI
+          SSL_CERT_FILE
+          TEST_MARKER
+          TRAVIS*
 setenv = COVERAGE_FILE={toxworkdir}/.coverage.{envname}
 usedevelop = True
 deps = -rrequirements.txt