diff --git a/infra/docker-compose.yml b/infra/docker-compose.yml
index 46c7ee1..78a5e47 100644
--- a/infra/docker-compose.yml
+++ b/infra/docker-compose.yml
@@ -41,6 +41,12 @@ services:
       HIY_BUILD_SCRIPT: /app/builder/build.sh
       CADDY_API_URL: http://caddy:2019
       DOCKER_HOST: tcp://podman-proxy:2375
+      # CONTAINER_HOST is the Podman-native equivalent of DOCKER_HOST.
+      # Setting it makes `podman` automatically operate in remote mode and
+      # delegate all builds/runs to the host's Podman service via the proxy,
+      # instead of trying to run Podman locally inside this container (which
+      # would fail: no user-namespace support in an unprivileged container).
+      CONTAINER_HOST: tcp://podman-proxy:2375
       RUST_LOG: hiy_server=debug,tower_http=info
     depends_on:
       caddy: