You may need to reset file/directory permissions on your WordPress build. This could be because you have had an error updating WordPress due to failed permissions on certain files/folders.
Reset Permissions
# Let Apache be owner (on centos this would be apache:apache) sudo chown -R www-data:www-data /path/to/wordpress/build/
# Change location so you're at the root of the WordPress build cd /path/to/wordpress/build/
# Change directory permissions rwxr-xr-x
sudo find . -type d -exec chmod 755 {} \;
# Change file permissions rw-r--r--
sudo find . -type f -exec chmod 644 {} \;
Tighten Security
After the setup you should tighten the access rights, according to Official Hardening WordPress all files except for wp-content should be writable by your user account only. wp-content must be writable by www-data too.
# Let your useraccount be owner chown : -R *
# Let apache be owner of wp-content (on centos this would be apache:apache) chown www-data:www-data wp-content
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