diff --git a/html5ever/fuzz/Cargo.toml b/html5ever/fuzz/Cargo.toml
index b4dcbe1b..5b32ace5 100644
--- a/html5ever/fuzz/Cargo.toml
+++ b/html5ever/fuzz/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 cargo-fuzz = true
 
 [dependencies]
-libfuzzer-sys = "0.3"
+libfuzzer-sys = "0.4.0"
 
 [dependencies.html5ever]
 path = ".."