this will leave your existing nginx 1.18.0 intact just in case, but will replace the running version of nginx with 1.27.0
cd /usr/src/
wget https://nginx.org/download/nginx-1.27.0.tar.gz
tar xvf nginx-1.27.0.tar.gz
cd nginx-1.27.0
./configure --with-cc-opt='-g -O2 -fdebug-prefix-map=/build/nginx-Iwde_Y/nginx-1.18.0=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-compat --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_sub_module
make && make install
systemctl stop nginx
mv /usr/sbin/nginx /usr/sbin/nginxO; ln -s /usr/share/nginx/sbin/nginx /usr/sbin/nginx
disable some non used old modules
rm /etc/nginx/modules-enabled/50-mod-http-image-filter.conf
rm /etc/nginx/modules-enabled/50-mod-stream.conf
rm /etc/nginx/modules-enabled/70-mod-stream-geoip.conf
rm /etc/nginx/modules-enabled/50-mod-http-geoip.conf
rm /etc/nginx/modules-enabled/50-mod-http-xslt-filter.conf
rm /etc/nginx/modules-enabled/50-mod-mail.conf
nginx -t (and make sure all is ok)
then systemctl start nginx