diff --git a/debian/control b/debian/control
index 4f0deb1b1..bb15b913e 100644
--- a/debian/control
+++ b/debian/control
@@ -44,6 +44,8 @@ Build-Depends:
  python3-ruamel.yaml,
  python3-setuptools,
  python3-setuptools-git,
+# python3-tomli is not available in Bullseye
+ python3-tomli | python3-coverage (<< 6.0),
  python3-yaml,
  sshpass,
  xmlto,
diff --git a/debian/tests/control b/debian/tests/control
index 7af979174..91a1d9644 100644
--- a/debian/tests/control
+++ b/debian/tests/control
@@ -14,4 +14,4 @@ Restrictions: needs-root
 # Run unit and integration tests on installed files.
 #
 Test-Command: PYTHONPATH='/usr/lib/python3/dist-packages/plinth/' py.test-3 -p no:cacheprovider --cov=plinth --cov-report=html:debci/htmlcov --cov-report=term
-Depends: git, python3-openssl, python3-pytest, python3-pytest-cov, python3-pytest-django, @
+Depends: git, python3-openssl, python3-pytest, python3-pytest-cov, python3-pytest-django, python3-tomli | python3-coverage (<< 6.0), @
diff --git a/setup.py b/setup.py
index 9855f177a..936690c98 100755
--- a/setup.py
+++ b/setup.py
@@ -309,6 +309,7 @@ setuptools.setup(
         'pytest-django',
         'flake8',
         'requests',
+        'tomli',
     ],
     package_data={
         '': ['templates/*', 'static/*', 'locale/*/LC_MESSAGES/*.mo']