diff --git a/docker-compose.yml b/docker-compose.yml
index 5dfcc63..6acb4e1 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -7,7 +7,7 @@ services:
       replicas: 0 # will scale after mongo initated
       restart_policy:
         condition: any
-    image: rocketchat/rocket.chat:3.5.4
+    image: rocketchat/rocket.chat:3.5.4@sha256:f5978d325f9b63abe42adebecb9a3b891fa5ffaf9840ea252c134ed9ac6c09b8
     networks:
       - appnet
       - externalnet
@@ -28,7 +28,7 @@ services:
       replicas: 1
       restart_policy:
         condition: any
-    image: mongo:4.4
+    image: mongo:4.4@sha256:ebd31eaac273a9544a33387aa859b0a8676565340a40fc824fa7bda686f462f1
     networks:
       - appnet
     environment: