diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 05e3b42..e62604e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,7 +29,7 @@ jobs:
           python -m pip install -r requirements-dev.txt
       - name: Run pytest
         env:
-          TAKAHE_DATABASE_URL: "postgres://postgres:postgres@localhost:${{ job.services.postgres.ports[5432] }}/postgres"
+          TAKAHE_DATABASE_SERVER: "postgres://postgres:postgres@localhost:${{ job.services.postgres.ports[5432] }}/postgres"
           TAKAHE_ENVIRONMENT: "test"
           TAKAHE_SECRET_KEY: "testing_secret"
           TAKAHE_MAIN_DOMAIN: "example.com"
diff --git a/users/admin.py b/users/admin.py
index 7a54c52..f0d484d 100644
--- a/users/admin.py
+++ b/users/admin.py
@@ -68,6 +68,7 @@ class InboxMessageAdmin(admin.ModelAdmin):
     list_display = ["id", "state", "state_attempted", "message_type", "message_actor"]
     search_fields = ["message"]
     actions = ["reset_state"]
+    readonly_fields = ["state_changed"]
 
     @admin.action(description="Reset State")
     def reset_state(self, request, queryset):