diff --git a/pkg/healthcheck/testdata/traefik/local-port/docker-compose.yml b/pkg/healthcheck/testdata/traefik/local-port/docker-compose.yml
index 332c79a..17033a5 100644
--- a/pkg/healthcheck/testdata/traefik/local-port/docker-compose.yml
+++ b/pkg/healthcheck/testdata/traefik/local-port/docker-compose.yml
@@ -1,8 +1,8 @@
 services:
   drupal:
-    image: drupal:latest
+    image: drupal:latest@sha256:7a93ee9c8bec6a780cc25ec4e1610ae6dde483368db3d5aa0ac477567a645d6b
   traefik:
-    image: traefik:v3
+    image: traefik:v3@sha256:652929a140a32d7cafafb13c6cdfab5376cfeff800f51397b87b524501ed02a8
     command: >-
       --entryPoints.http.address=:80
       --providers.file.directory=/etc/traefik/dynamic
diff --git a/pkg/healthcheck/testdata/traefik/pathless/docker-compose.yml b/pkg/healthcheck/testdata/traefik/pathless/docker-compose.yml
index 59988d7..6df7feb 100644
--- a/pkg/healthcheck/testdata/traefik/pathless/docker-compose.yml
+++ b/pkg/healthcheck/testdata/traefik/pathless/docker-compose.yml
@@ -2,7 +2,7 @@ services:
   archivesspace:
     image: archivesspace:latest
   traefik:
-    image: traefik:v3
+    image: traefik:v3@sha256:652929a140a32d7cafafb13c6cdfab5376cfeff800f51397b87b524501ed02a8
     command:
       - --entryPoints.web.address=:80
       - --providers.file.directory=/etc/traefik/dynamic
diff --git a/pkg/healthcheck/testdata/traefik/tls/docker-compose.yml b/pkg/healthcheck/testdata/traefik/tls/docker-compose.yml
index e8dde38..3572ae1 100644
--- a/pkg/healthcheck/testdata/traefik/tls/docker-compose.yml
+++ b/pkg/healthcheck/testdata/traefik/tls/docker-compose.yml
@@ -1,8 +1,8 @@
 services:
   drupal:
-    image: drupal:latest
+    image: drupal:latest@sha256:7a93ee9c8bec6a780cc25ec4e1610ae6dde483368db3d5aa0ac477567a645d6b
   traefik:
-    image: traefik:v3
+    image: traefik:v3@sha256:652929a140a32d7cafafb13c6cdfab5376cfeff800f51397b87b524501ed02a8
     command:
       - --entryPoints.http.address=:80
       - --entryPoints.https.address=:443