diff --git a/internal/api/rust/rust.go b/internal/api/rust/rust.go
index 7f0303d..323bc49 100644
--- a/internal/api/rust/rust.go
+++ b/internal/api/rust/rust.go
@@ -64,7 +64,10 @@ type RustClient struct {
 func NewRustClient(t ct.TestLike, opts api.ClientCreationOpts) (api.Client, error) {
 	t.Logf("NewRustClient[%s][%s] creating...", opts.UserID, opts.DeviceID)
 	matrix_sdk_ffi.LogEvent("rust.go", &zero, matrix_sdk_ffi.LogLevelInfo, t.Name(), fmt.Sprintf("NewRustClient[%s][%s] creating...", opts.UserID, opts.DeviceID))
-	ab := matrix_sdk_ffi.NewClientBuilder().HomeserverUrl(opts.BaseURL).SlidingSyncProxy(&opts.SlidingSyncURL).AutoEnableCrossSigning(true)
+	ab := matrix_sdk_ffi.NewClientBuilder()
+		.HomeserverUrl(opts.BaseURL)
+		.SlidingSyncVersionBuilder(&matrix_sdk_ffi.SlidingSyncVersionBuilderProxy{ Url: &opts.SlidingSyncURL })
+		.AutoEnableCrossSigning(true)
 	var clientSessionDelegate matrix_sdk_ffi.ClientSessionDelegate
 	if opts.EnableCrossProcessRefreshLockProcessName != "" {
 		t.Logf("enabling cross process refresh lock with proc name=%s", opts.EnableCrossProcessRefreshLockProcessName)