diff --git a/docker-compose.yml b/docker-compose.yml
index 7d269d0..6074339 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -16,7 +16,7 @@ services:
       retries: 5
 
   garage:
-    image: dxflrs/garage:v2.2.0
+    image: dxflrs/garage:v2.2.0@sha256:45a61ce3f7c9c24fc23d9ed2b09b27ed560ab87b34605d175d5c588f539c24e4
     environment:
       GARAGE_ALLOW_WORLD_READABLE_SECRETS: "true"
     volumes:
diff --git a/docker/backup/Dockerfile b/docker/backup/Dockerfile
index 4cbf3c2..1ba1030 100644
--- a/docker/backup/Dockerfile
+++ b/docker/backup/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.23
+FROM alpine:3.23@sha256:25109184c71bdad752c8312a8623239686a9a2071e8825f20acb8f2198c3f659
 
 # Install PostgreSQL client and dependencies
 # PostgreSQL 18 client is available in Alpine edge