diff --git a/.forgejo/workflows/test-backend.yml b/.forgejo/workflows/test-backend.yml
index e4bce0e88d..76069ee959 100644
--- a/.forgejo/workflows/test-backend.yml
+++ b/.forgejo/workflows/test-backend.yml
@@ -28,7 +28,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres:15
+        image: l1drm/postgres-pgroonga:alpine-15-znver4
         env:
           POSTGRES_DB: test-misskey
           POSTGRES_HOST_AUTH_METHOD: trust
@@ -68,7 +68,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres:15
+        image: l1drm/postgres-pgroonga:alpine-15-znver4
         env:
           POSTGRES_DB: test-misskey
           POSTGRES_HOST_AUTH_METHOD: trust