diff --git a/pkgs/tools/system/acpica-tools/default.nix b/pkgs/tools/system/acpica-tools/default.nix
index a8fb57b2fba0..f26142260fef 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 = "20180313";
+  version = "20180427";
 
   src = fetchurl {
     url = "https://acpica.org/sites/acpica/files/acpica-unix-${version}.tar.gz";
-    sha256 = "05ab2xfv9wqwbzjaa9xqgrvvan87rxv29hw48h1gcckpc5smp2wm";
+    sha256 = "05hczn82dpn7irh8zy9m17hm8r3ngwrbmk69zsldr4k1w3cv40df";
   };
 
   NIX_CFLAGS_COMPILE = "-O3";