diff --git a/requirements/ci.txt b/requirements/ci.txt
index 89af7d2..317c774 100644
--- a/requirements/ci.txt
+++ b/requirements/ci.txt
@@ -51,7 +51,7 @@ tomli==2.0.1
     # via
     #   -r requirements/tox.txt
     #   tox
-tox==4.11.3
+tox==3.28.0
     # via
     #   -c requirements/common_constraints.txt
     #   -r requirements/tox.txt
diff --git a/requirements/tox.txt b/requirements/tox.txt
index af3c84c..eef11a1 100644
--- a/requirements/tox.txt
+++ b/requirements/tox.txt
@@ -22,7 +22,7 @@ six==1.16.0
     # via tox
 tomli==2.0.1
     # via tox
-tox==4.11.3
+tox==3.28.0
     # via
     #   -c requirements/common_constraints.txt
     #   -r requirements/tox.in
diff --git a/tox.ini b/tox.ini
index f33a5c4..7a7fa59 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,9 @@ deps =
 skip_install = True
 
 [testenv:csslint]
-allowlist_externals = {toxinidir}/node_modules/csslint/dist/cli.js
+allowlist_externals =
+    make
+    {toxinidir}/node_modules/csslint/dist/cli.js
 passenv =
     TRAVIS
     TRAVIS_JOB_ID
@@ -31,7 +33,9 @@ deps =
 skip_install = True
 
 [testenv:eslint]
-allowlist_externals = {toxinidir}/node_modules/eslint/bin/eslint.js
+allowlist_externals =
+    make
+    {toxinidir}/node_modules/eslint/bin/eslint.js
 passenv =
     TRAVIS
     TRAVIS_JOB_ID