diff --git a/Cargo.toml b/Cargo.toml
index 5a90ff8..b4ce928 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,4 +22,4 @@ serde_yaml_ng = "0.10"
 
 [dev-dependencies]
 tempfile = "3.3"
-serial_test = "3.0"
+serial_test = "4.0"