diff --git a/.ci/ruff.sh b/.ci/ruff.sh
index 0afdbacc..2482b6f8 100755
--- a/.ci/ruff.sh
+++ b/.ci/ruff.sh
@@ -4,7 +4,8 @@
 
 if [ "$(id -u)" = 0 ]; then
 	set -x
-	apk -q add ruff
+	apk -q add py3-pip
+	pip install --break-system-packages --no-warn-script-location ruff
 	exec su "${TESTUSER:-build}" -c "sh -e $0"
 fi