diff --git a/.ci/functional-tests.yml b/.ci/functional-tests.yml
index 841771cb8..3089ce1ad 100644
--- a/.ci/functional-tests.yml
+++ b/.ci/functional-tests.yml
@@ -34,7 +34,7 @@
     - adduser tester --gecos "First Last,RoomNumber,WorkPhone,HomePhone" --disabled-password && echo "tester:password" | chpasswd
   script:
     - cp -r . /home/tester/freedombox && chown -R tester:tester /home/tester/freedombox
-    - sudo -u tester bash -c 'pip3 install --user splinter pytest-splinter pytest-reporter-html1'
+    - sudo -u tester bash -c 'pip3 install --user selenium==4.2.0 splinter==0.17.0 pytest-splinter pytest-reporter-html1'
     - |
       sudo FREEDOMBOX_URL="https://$APP_SERVER_IP" -u tester bash -c \
         'cd /home/tester/freedombox && py.test-3 -v --durations=10 --include-functional --splinter-headless --template=html1/index.html --report=functional-tests.html'
diff --git a/plinth/tests/functional/install.sh b/plinth/tests/functional/install.sh
index 484de4ac6..829274bfb 100755
--- a/plinth/tests/functional/install.sh
+++ b/plinth/tests/functional/install.sh
@@ -7,7 +7,8 @@ sudo apt-get install -yq --no-install-recommends \
     python3-pytest python3-pytest-django python3-pytest-xdist \
     python3-pip python3-wheel firefox-esr git smbclient
 
-pip3 install --user splinter pytest-splinter pytest-reporter-html1
+# Use compatible versions of Splinter and Selenium
+pip3 install --user selenium==4.2.0 splinter==0.17.0 pytest-splinter pytest-reporter-html1
 
 echo "Installing geckodriver"
 (