diff --git a/core/Cargo.toml b/core/Cargo.toml
index db7830e0..f1a08029 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -21,7 +21,7 @@ instant = "0.1.4"
 libc = "0.2.71"
 
 [target.'cfg(target_os = "redox")'.dependencies]
-redox_syscall = "0.1.56"
+redox_syscall = "0.2.4"
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3.8", features = ["winnt", "ntstatus", "minwindef",