diff --git a/docker-compose.yaml b/docker-compose.yaml
index 2df6d61..e1a49f1 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -1,6 +1,6 @@
 services:
   poste.io:
-    image: analogic/poste.io:2.3.21
+    image: analogic/poste.io:2.3.21@sha256:5d56570028bf710efdb9df2945491fdd6271abadb2856039bbe30ff90f9af6d3
     container_name: posteio
     tty: true
     network_mode: host