diff --git a/docker-compose.yaml b/docker-compose.yaml
index 6abc123..ce8645b 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -9,11 +9,12 @@ services:
       - traefik.port=3000
       - traefik.frontend.passHostHeader=true
       - traefik.enable=true
-      - traefik.http.middlewares.testheader.headers.accesscontrolallowmethods=GET,OPTIONS,PUT
-      - traefik.http.middlewares.testheader.headers.accesscontrolallowheaders=*
-      - traefik.http.middlewares.testheader.headers.accesscontrolalloworiginlist=https://chaospott.de
-      - traefik.http.middlewares.testheader.headers.accesscontrolmaxage=100
-      - traefik.http.middlewares.testheader.headers.addvaryheader=true
+      - traefik.frontend.headers.customResponseHeaders=Access-Control-Allow-Origin:*
+      # NOTE: This is for Traefik v2, apparently.
+      - traefik.http.middlewares.cors.headers.accesscontrolallowmethods=GET,OPTIONS,PUT
+      - traefik.http.middlewares.cors.headers.accesscontrolalloworiginlist=https://chaospott.de
+      - traefik.http.middlewares.cors.headers.accesscontrolmaxage=100
+      - traefik.http.middlewares.cors.headers.addvaryheader=true
     networks:
       - extern