diff --git a/docker-compose.yml b/docker-compose.yml
index a9027c0..59deb0d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: '3.2'
+version: '3.1'
 
 volumes:
     prometheus_data: {}
@@ -11,7 +11,7 @@ networks:
 services:
 
   prometheus:
-    image: prom/prometheus
+    image: prom/prometheus:v2.0.0
     volumes:
       - ./prometheus/:/etc/prometheus/
       - prometheus_data:/prometheus
@@ -38,15 +38,9 @@ services:
   node-exporter:
     image: prom/node-exporter
     volumes:
-      - type: bind
-        source: /proc
-        target: /host/proc
-      - type: bind
-        source: /sys
-        target: /host/sys
-      - type: bind
-        source: /
-        target: /rootfs
+      - /proc:/host/proc
+      - /sys:/host/sys
+      - /:/rootfs
     command: 
       - '--path.procfs=/host/proc' 
       - '--path.sysfs=/host/sys'
diff --git a/prometheus/alert.rules b/prometheus/alert.rules
index 0cc6836..9b6df9b 100644
--- a/prometheus/alert.rules
+++ b/prometheus/alert.rules
@@ -10,7 +10,7 @@ groups:
       severity: page
     annotations:
       summary: "Instance {{ $labels.instance }} down"
-      description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 5 minutes."
+      description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 2 minutes."
 
   - alert: high_load
     expr: node_load1 > 0.5
@@ -19,4 +19,4 @@ groups:
       severity: page
     annotations:
       summary: "Instance {{ $labels.instance }} under high load"
-      description: "{{ $labels.instance }} of job {{ $labels.job }} is under high load."
+      description: "{{ $labels.instance }} of job {{ $labels.job }} is under high load."
\ No newline at end of file
diff --git a/prometheus/prometheus.yml b/prometheus/prometheus.yml
index ffecd9f..58c5293 100644
--- a/prometheus/prometheus.yml
+++ b/prometheus/prometheus.yml
@@ -15,11 +15,13 @@ rule_files:
   # - "first.rules"
   # - "second.rules"
 
+# alert
 alerting:
   alertmanagers:
-  - static_configs:
+  - scheme: http
+    static_configs:
     - targets:
-      - alertmanager:9093
+      - "alertmanager:9093"
 
 # A scrape configuration containing exactly one endpoint to scrape:
 # Here it's Prometheus itself.