diff --git a/Cargo.toml b/Cargo.toml
index cbacc20..a9ea88b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,4 +22,4 @@ smallvec = { version = "1.6", features = ["const_generics"]}
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1"
 rand = "0.8"
-serial_test = "*"
+serial_test = "0.5"