diff --git a/third_party/gopkgs/golang.org/x/sys/default.nix b/third_party/gopkgs/golang.org/x/sys/default.nix
index 19e1b29ef2..d257a0964f 100644
--- a/third_party/gopkgs/golang.org/x/sys/default.nix
+++ b/third_party/gopkgs/golang.org/x/sys/default.nix
@@ -8,7 +8,7 @@ depot.third_party.buildGo.external {
   src = depot.third_party.nixpkgs.fetchFromGitHub {
     owner = "golang";
     repo = "sys";
-    rev = "da207088b7d1961c44ec61e9dc15a73745693ab6";
-    hash = "sha256:1i8q11i494cp3qia8w64k69wlcy4lgw9yya79yv85dz4brry29l8";
+    rev = "v0.4.0";
+    hash = "sha256:0fr2d6fnpbqx6n89sg9lsinqkdaw49y068kqj2g0cxlhbh69hzii";
   };
 }