diff --git a/test_suite/Cargo.toml b/test_suite/Cargo.toml
index b0ddbb8a..53effd4e 100644
--- a/test_suite/Cargo.toml
+++ b/test_suite/Cargo.toml
@@ -23,4 +23,4 @@ rustversion = "1.0"
 serde = { path = "../serde", features = ["rc", "derive"] }
 serde_derive = { path = "../serde_derive", features = ["deserialize_in_place"] }
 serde_test = { path = "../serde_test" }
-trybuild = "1.0"
+trybuild = { version = "1.0.19", features = ["diff"] }