diff --git a/docker-compose.yml b/docker-compose.yml
index e74adc0..07c4f1a 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -2,44 +2,42 @@ version: "3.8"
 
 services:
   mongodb:
-    image: "mongo:4.4"
+    image: "mongo:4.2"
     volumes:
       - "mongodb_data:/data/db"
     restart: "on-failure"
 
-  opensearch:
-    image: "opensearchproject/opensearch:2.4.0"
+  elasticsearch:
     environment:
-      - "OPENSEARCH_JAVA_OPTS=-Xms1g -Xmx1g"
-      - "bootstrap.memory_lock=true"
-      - "discovery.type=single-node"
-      - "action.auto_create_index=false"
-      - "plugins.security.ssl.http.enabled=false"
-      - "plugins.security.disabled=true"
+      ES_JAVA_OPTS: "-Xms1g -Xmx1g -Dlog4j2.formatMsgNoLookups=true"
+      bootstrap.memory_lock: "true"
+      discovery.type: "single-node"
+      http.host: "0.0.0.0"
+      action.auto_create_index: "false"
+    image: "docker.elastic.co/elasticsearch/elasticsearch-oss:7.10.2"
     ulimits:
       memlock:
         hard: -1
         soft: -1
     volumes:
-      - "os_data:/usr/share/opensearch/data"
+      - "es_data:/usr/share/elasticsearch/data"
     restart: "on-failure"
 
   graylog:
-    hostname: "server"
-    image: "${GRAYLOG_IMAGE:-graylog/graylog:5.0}"
+    image: "graylog/graylog:4.2"
     depends_on:
-      opensearch:
+      elasticsearch:
         condition: "service_started"
       mongodb:
         condition: "service_started"
-    entrypoint: "/usr/bin/tini -- wait-for-it opensearch:9200 --  /docker-entrypoint.sh"
+    entrypoint: "/usr/bin/tini -- wait-for-it elasticsearch:9200 --  /docker-entrypoint.sh"
     environment:
       GRAYLOG_NODE_ID_FILE: "/usr/share/graylog/data/config/node-id"
-      GRAYLOG_PASSWORD_SECRET: "${GRAYLOG_PASSWORD_SECRET:?Please configure GRAYLOG_PASSWORD_SECRET in the .env file}"
-      GRAYLOG_ROOT_PASSWORD_SHA2: "${GRAYLOG_ROOT_PASSWORD_SHA2:?Please configure GRAYLOG_ROOT_PASSWORD_SHA2 in the .env file}"
-      GRAYLOG_HTTP_BIND_ADDRESS: "0.0.0.0:9000"
+      GRAYLOG_PASSWORD_SECRET: ${GRAYLOG_PASSWORD_SECRET:?Please configure GRAYLOG_PASSWORD_SECRET in the .env file}
+      GRAYLOG_ROOT_PASSWORD_SHA2: ${GRAYLOG_ROOT_PASSWORD_SHA2:?Please configure GRAYLOG_ROOT_PASSWORD_SHA2 in the .env file}
+      GRAYLOG_HTTP_BIND_ADDRESS: "0.0.0.0:9001"
       GRAYLOG_HTTP_EXTERNAL_URI: "http://localhost:9001/"
-      GRAYLOG_ELASTICSEARCH_HOSTS: "http://opensearch:9200"
+      GRAYLOG_ELASTICSEARCH_HOSTS: "http://elasticsearch:9200"
       GRAYLOG_MONGODB_URI: "mongodb://mongodb:27017/graylog"
     ports:
     - "5044:5044/tcp"   # Beats
@@ -58,9 +56,8 @@ services:
       - "graylog_data:/usr/share/graylog/data/data"
       - "graylog_journal:/usr/share/graylog/data/journal"
     restart: "on-failure"
-
 volumes:
   mongodb_data:
-  os_data:
+  es_data:
   graylog_data:
-  graylog_journal:
+  graylog_journal:
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