diff --git a/docker/Dockerfile.nginx b/docker/Dockerfile.nginx
index 5950fc1..9fd47ff 100644
--- a/docker/Dockerfile.nginx
+++ b/docker/Dockerfile.nginx
@@ -1,4 +1,4 @@
-FROM nginx:mainline AS builder
+FROM nginx:mainline@sha256:fb197595ebe76b9c0c14ab68159fd3c08bd067ec62300583543f0ebda353b5be AS builder
 
 # Install necessary build tools
 RUN apt-get update && apt-get install -y wget build-essential libpcre3-dev zlib1g-dev libssl-dev
@@ -16,7 +16,7 @@ RUN cd nginx-$NGINX_VERSION && \
     ./configure --with-compat --add-dynamic-module=../nginx-module-vts-0.2.2 && \
     make modules
 
-FROM nginx:mainline
+FROM nginx:mainline@sha256:fb197595ebe76b9c0c14ab68159fd3c08bd067ec62300583543f0ebda353b5be
 
 # Copy the compiled module
 COPY --from=builder /nginx-$NGINX_VERSION/objs/ngx_http_vhost_traffic_status_module.so /usr/lib/nginx/modules/
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index dbe9462..2f6710f 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -33,7 +33,7 @@ services:
   nginx-exporter:
     <<: *base
     container_name: nginx-exporter
-    image: nginx/nginx-prometheus-exporter
+    image: nginx/nginx-prometheus-exporter@sha256:6477cf3bddc4e042d3496856fb2e8e382301bac47fb18cb83924389717261cb1
     command:
       - -nginx.scrape-uri=http://nginx/metrics
     ports:
@@ -44,7 +44,7 @@ services:
   prometheus:
     <<: *base
     container_name: prometheus
-    image: prom/prometheus
+    image: prom/prometheus@sha256:565ee86501224ebbb98fc10b332fa54440b100469924003359edf49cbce374bd
     ports:
       - "9090:9090"
     volumes:
@@ -55,7 +55,7 @@ services:
   grafana:
     <<: *base
     container_name: grafana
-    image: grafana/grafana
+    image: grafana/grafana@sha256:fa801ab6e1ae035135309580891e09f7eb94d1abdbd2106bdc288030b028158c
     ports:
       - "3000:3000"
     volumes: