diff --git a/pkgs/tools/system/acpica-tools/default.nix b/pkgs/tools/system/acpica-tools/default.nix
index c738b611f946..54303d0c177d 100644
--- a/pkgs/tools/system/acpica-tools/default.nix
+++ b/pkgs/tools/system/acpica-tools/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "acpica-tools-${version}";
-  version = "20180810";
+  version = "20180927";
 
   src = fetchurl {
     url = "https://acpica.org/sites/acpica/files/acpica-unix-${version}.tar.gz";
-    sha256 = "1wqy5kizmlk8y92vqhj387j5j9cfzaxxn55r490jxibl1qfr2hr6";
+    sha256 = "1c9d505mw1wyga65y4nmiz55gs357z97wnycx77yvjwvi08qsh6w";
   };
 
   NIX_CFLAGS_COMPILE = "-O3";