diff --git a/scripts/install b/scripts/install
index 008a67a..98bd281 100755
--- a/scripts/install
+++ b/scripts/install
@@ -189,7 +189,7 @@ virtualenv --python=python3 "${final_path}/venv"
 	# prevent error: "command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers"
 	pip install --upgrade setuptools
 	pip install Weblate=="$current_version"
-	pip install pytz python-bidi PyYaML Babel pyuca pylibravatar py3dns psycopg2-binary phply django-redis hiredis aeidon
+	pip install pytz python-bidi PyYaML Babel pyuca pylibravatar py3dns psycopg2-binary phply django-redis hiredis aeidon ruamel.yaml
 	# specific to YunoHost package:
 	pip install django_sendmail_backend
 )
diff --git a/scripts/upgrade b/scripts/upgrade
index 63dc8c8..cc50c78 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -180,7 +180,7 @@ ynh_script_progression --message="Install weblate using PIP..." --time --weight=
 	# prevent error: "command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers"
 	pip install --upgrade setuptools
 	pip install Weblate=="$current_version"
-	pip install pytz python-bidi PyYaML Babel pyuca pylibravatar py3dns psycopg2-binary phply django-redis hiredis aeidon
+	pip install pytz python-bidi PyYaML Babel pyuca pylibravatar py3dns psycopg2-binary phply django-redis hiredis aeidon ruamel.yaml
 	# specific to YunoHost package:
 	pip install django_sendmail_backend
 )