diff --git a/docker-compose.yml b/docker-compose.yml
index 87e3e5c..48aad67 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:3.0.7
+    image: rocketchat/rocket.chat:3.0.7@sha256:d3f92ab55ab97bf122f8e7e535a0302ba3a2965250bcfb8726409f3d28026a90
     networks:
       - appnet
       - externalnet
@@ -28,7 +28,7 @@ services:
       replicas: 1
       restart_policy:
         condition: any
-    image: mongo:4.0
+    image: mongo:4.0@sha256:faeadb93ff03d940feb01692138fcf20e2f193a53b07c26175e585415f0882ca
     networks:
       - appnet
     environment: