diff --git a/tool/Dockerfile.dev b/tool/Dockerfile.dev
index 1310de85..f305eada 100644
--- a/tool/Dockerfile.dev
+++ b/tool/Dockerfile.dev
@@ -2,6 +2,8 @@ ARG SERVER_VERSION=27.1.3-fpm-alpine@sha256:f1a13c7f60a9e9f5dcf14b7cb097083833ea
 FROM nextcloud:$SERVER_VERSION
 
 WORKDIR /usr/src/nextcloud
+RUN chown -R www-data:www-data .
+USER www-data
 
 RUN ./occ maintenance:install --admin-pass admin --admin-email admin@example.com
 RUN ./occ config:system:set allow_local_remote_servers --value=true
diff --git a/tool/send-push-notification-test.sh b/tool/send-push-notification-test.sh
index 9d25ac08..34a56622 100755
--- a/tool/send-push-notification-test.sh
+++ b/tool/send-push-notification-test.sh
@@ -3,4 +3,4 @@ set -euxo pipefail
 cd "$(dirname "$0")/.."
 source tool/common.sh
 
-docker exec -it "$(docker ps | grep "$(image_tag "dev:latest")" | cut -d " " -f 1)" /bin/bash -c "php -f occ notification:test-push $*"
+docker exec -it "$(docker ps | grep "$(image_tag "dev:latest")" | cut -d " " -f 1)" /bin/sh -c "php -f occ notification:test-push $*"