diff --git a/gio/Cargo.toml b/gio/Cargo.toml
index 8080456e4600..1dfc002a3c03 100644
--- a/gio/Cargo.toml
+++ b/gio/Cargo.toml
@@ -54,4 +54,4 @@ smallvec = "1"
 futures = "0.3"
 futures-util = { version = "0.3", features = ["io"] }
 gir-format-check = "^0.1"
-serial_test = "1"
+serial_test = "2"