diff --git a/internal/config/config.go b/internal/config/config.go
index 41f17c6..26691fd 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -116,7 +116,7 @@ func defaultConfig() *Config {
 		IM: IMConfig{
 			BaseURL: "https://api.118im.com", HTTPAPIURL: "https://api.118im.com/v1/im",
 			WebSocketURL: "wss://api.118im.com/v0/channels", FileURL: "https://api.118im.com/v0/file",
-			TenantCode: "allrich", APIKey: "AQAAAAABAAChdu8_yk0OxZcId6FnwYNS",
+			TenantCode: "default", APIKey: "AQAAAAABAAChdu8_yk0OxZcId6FnwYNS",
 			InternalService: "olons-server", Timeout: 8 * time.Second,
 		},
 		ReadTimeout:  8 * time.Second,
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 269ab5d..54d4420 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -11,6 +11,9 @@ func TestDefaultConfigUsesOlonsAdmin(t *testing.T) {
 	if err := cfg.validate(); err != nil {
 		t.Fatal(err)
 	}
+	if cfg.IM.TenantCode != "default" {
+		t.Fatalf("unexpected default IM tenant: %q", cfg.IM.TenantCode)
+	}
 }
 
 func TestConfigRejectsOtherDatabase(t *testing.T) {