diff --git a/plinth/tests/functional/install.sh b/plinth/tests/functional/install.sh
index 829274bfb..4ad8ee8b4 100755
--- a/plinth/tests/functional/install.sh
+++ b/plinth/tests/functional/install.sh
@@ -8,7 +8,7 @@ sudo apt-get install -yq --no-install-recommends \
     python3-pip python3-wheel firefox-esr git smbclient
 
 # Use compatible versions of Splinter and Selenium
-pip3 install --user selenium==4.2.0 splinter==0.17.0 pytest-splinter pytest-reporter-html1
+pip3 install --user --break-system-packages selenium==4.2.0 splinter==0.17.0 pytest-splinter pytest-reporter-html1
 
 echo "Installing geckodriver"
 (