diff --git a/apps/archy-mempool-web/manifest.yml b/apps/archy-mempool-web/manifest.yml
index 9a956224..6d84df8d 100644
--- a/apps/archy-mempool-web/manifest.yml
+++ b/apps/archy-mempool-web/manifest.yml
@@ -33,7 +33,10 @@ app:
 
   health_check:
     type: http
-    endpoint: http://localhost:8080
+    # 127.0.0.1 not localhost: the image's wget resolves localhost to ::1 (IPv6)
+    # first, but nginx binds 0.0.0.0:8080 (IPv4) only -> localhost probe gets
+    # "connection refused" -> perpetual unhealthy -> health_monitor restart loop.
+    endpoint: http://127.0.0.1:8080
     path: /
     interval: 30s
     timeout: 5s
diff --git a/releases/app-catalog.json b/releases/app-catalog.json
index 532a99c0..d72b92af 100644
--- a/releases/app-catalog.json
+++ b/releases/app-catalog.json
@@ -235,7 +235,7 @@
           ],
           "health_check": {
             "type": "http",
-            "endpoint": "http://localhost:8080",
+            "endpoint": "http://127.0.0.1:8080",
             "path": "/",
             "interval": "30s",
             "timeout": "5s",