diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 4bf12bb25d..98e20b70d5 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -11,7 +11,7 @@ edition = "2018"
 cargo-fuzz = true
 
 [dependencies]
-libfuzzer-sys = "0.3"
+libfuzzer-sys = "0.4.0"
 
 [dependencies.regex]
 path = ".."