diff --git a/Cargo.toml b/Cargo.toml
index 7175286d..9be10030 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,7 +38,7 @@ kstring = { version = "1", features = ["max_inline"] }
 [dev-dependencies]
 serde_json = "1.0.44"
 pretty_assertions = "0.7.1"
-toml-test-harness = "0.3"
+toml-test-harness = "0.4"
 criterion = "0.3"
 toml = "0.5"