diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ee12cfdc..3bb652f5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
       matrix:
         os: [ubuntu-20.04]
         python-version: ['3.8']
-        toxenv: [django32, django42, quality, docs, pii_check]
+        toxenv: [django32, django40, django42, quality, docs, pii_check]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/tox.ini b/tox.ini
index bb96b6ad..ca5676c3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py38-django{32,42}, quality, docs, pii_check
+envlist = py38-django{32,40,42}, quality, docs, pii_check
 skipsdist = true
 
 [doc8]
@@ -38,6 +38,7 @@ norecursedirs = .* docs requirements site-packages
 [testenv]
 deps = 
     django32: Django>=3.2,<4.0
+    django40: Django>=4.0,<4.1
     django42: Django>=4.2,<4.3
     -r{toxinidir}/requirements/test.txt
 commands =