diff --git a/public/v4/apps/mailtrain.yml b/public/v4/apps/mailtrain.yml
index 74e59c9..6442587 100644
--- a/public/v4/apps/mailtrain.yml
+++ b/public/v4/apps/mailtrain.yml
@@ -46,14 +46,14 @@ services:
     caproverExtra:
       containerHttpPort: "3000"
   $$cap_appname-$$cap_mailtrain_sandbox-appname:
-    image: caprover/nginx-reverse-proxy:latest
+    image: caprover/nginx-reverse-proxy@sha256:6bdb54abf8c3010126a532ecd6f457a1d09bdd708c40693c5762e93fe77817aa
     restart: always
     depends_on:
       - $$cap_appname
     environment:
       UPSTREAM_HTTP_ADDRESS: http://srv-captain--$$cap_appname:3003
   $$cap_appname-$$cap_mailtrain_lists-appname:
-    image: caprover/nginx-reverse-proxy:latest
+    image: caprover/nginx-reverse-proxy@sha256:6bdb54abf8c3010126a532ecd6f457a1d09bdd708c40693c5762e93fe77817aa
     restart: always
     depends_on:
       - $$cap_appname
diff --git a/public/v4/apps/nginx-redirect.yml b/public/v4/apps/nginx-redirect.yml
index c016443..62212ac 100644
--- a/public/v4/apps/nginx-redirect.yml
+++ b/public/v4/apps/nginx-redirect.yml
@@ -1,7 +1,7 @@
 captainVersion: 4
 services:
   $$cap_appname:
-    image: caprover/nginx-redirect:latest
+    image: caprover/nginx-redirect@sha256:9b1037462e62d61da7357fb6b95a01f0e6533205aca79a4ce8e02d0942369a31
     restart: always
     environment:
       RETURN_LOCATION: return 301 $$cap_redirect_url$request_uri;
diff --git a/public/v4/apps/nginx-reverse-proxy.yml b/public/v4/apps/nginx-reverse-proxy.yml
index 3f14233..16cc16a 100644
--- a/public/v4/apps/nginx-reverse-proxy.yml
+++ b/public/v4/apps/nginx-reverse-proxy.yml
@@ -1,7 +1,7 @@
 captainVersion: 4
 services:
   $$cap_appname:
-    image: caprover/nginx-reverse-proxy:latest
+    image: caprover/nginx-reverse-proxy@sha256:6bdb54abf8c3010126a532ecd6f457a1d09bdd708c40693c5762e93fe77817aa
     restart: always
     environment:
       UPSTREAM_HTTP_ADDRESS: $$cap_upstream_http_address