diff --git a/pkgs/os-specific/linux/kernel/linux-3.12.nix b/pkgs/os-specific/linux/kernel/linux-3.12.nix
index bd8c7d99daa..810087b55a7 100644
--- a/pkgs/os-specific/linux/kernel/linux-3.12.nix
+++ b/pkgs/os-specific/linux/kernel/linux-3.12.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, ... } @ args:
 
 import ./generic.nix (args // rec {
-  version = "3.12.40";
+  version = "3.12.42";
   extraMeta.branch = "3.12";
 
   src = fetchurl {
     url = "mirror://kernel/linux/kernel/v3.x/linux-${version}.tar.xz";
-    sha256 = "1cdivv1n0r057y2wq38ci00im8z24jrnvyz5vwhmnzv0l4qzbhw5";
+    sha256 = "0vp6yllal2gcyng1kklp9n8r18fhcb1m1ssavjbcbfax5chi7w5s";
   };
 
   features.iwlwifi = true;