diff --git a/Cargo.toml b/Cargo.toml
index 179012d..6d4702e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -73,7 +73,7 @@ features = [
 ]
 
 [target.'cfg(target_os = "redox")'.dependencies]
-redox_syscall = "0.3"
+redox_syscall = "0.4"
 
 [build-dependencies]
 cfg_aliases = "0.1.1"