diff --git a/pkgs/os-specific/linux/kernel/linux-grsecurity-4.5.nix b/pkgs/os-specific/linux/kernel/linux-grsecurity-4.5.nix
index 84d48865bcb7..94561ed2e549 100644
--- a/pkgs/os-specific/linux/kernel/linux-grsecurity-4.5.nix
+++ b/pkgs/os-specific/linux/kernel/linux-grsecurity-4.5.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
-  version = "4.5.5";
+  version = "4.5.6";
   extraMeta.branch = "4.5";
 
   src = fetchurl {
     url = "mirror://kernel/linux/kernel/v4.x/linux-${version}.tar.xz";
-    sha256 = "0l7wnilqqhg3im2v04g6k2x621yckdb9bpfh8s8jq9l2fixjln99";
+    sha256 = "1bdyviimgnc4zbgd9v1xk87sj9h8cprjykifriddwslqxyr2yh0y";
   };
 
   kernelPatches = args.kernelPatches;
diff --git a/pkgs/os-specific/linux/kernel/patches.nix b/pkgs/os-specific/linux/kernel/patches.nix
index 820e9ed6e264..59fa93480cfd 100644
--- a/pkgs/os-specific/linux/kernel/patches.nix
+++ b/pkgs/os-specific/linux/kernel/patches.nix
@@ -95,9 +95,9 @@ rec {
   grsecurity_4_5 = grsecPatch
     { kernel    = pkgs.grsecurity_base_linux_4_5;
       patches   = [ grsecurity_fix_path_4_5 ];
-      kversion  = "4.5.5";
-      revision  = "201605291201";
-      sha256    = "0r66l5zmvlb7phlvi1pma7vzj78krl23k8lcpdqlx27szr361sda";
+      kversion  = "4.5.6";
+      revision  = "201606051644";
+      sha256    = "1ympym3kpaychd1qsb10hn5ffv8w83ccfmb631hj4jk69xwrry9m";
     };
 
   grsecurity_latest = grsecurity_4_5;