diff --git a/ciborium/Cargo.toml b/ciborium/Cargo.toml
index ab957ec..96313b8 100644
--- a/ciborium/Cargo.toml
+++ b/ciborium/Cargo.toml
@@ -27,7 +27,7 @@ serde = { version = "1.0.170", default-features = false, features = ["alloc", "d
 
 [dev-dependencies]
 serde_bytes = "0.11"
-rstest = "0.20.0"
+rstest = "0.21.0"
 rand = "0.8"
 hex = "0.4"