diff --git a/pkgs/os-specific/linux/kernel/linux-grsecurity.nix b/pkgs/os-specific/linux/kernel/linux-grsecurity.nix
index d5ea9039891..c0849942f4f 100644
--- a/pkgs/os-specific/linux/kernel/linux-grsecurity.nix
+++ b/pkgs/os-specific/linux/kernel/linux-grsecurity.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
-  version = "4.6.3";
+  version = "4.6.4";
   extraMeta.branch = "4.6";
 
   src = fetchurl {
     url = "mirror://kernel/linux/kernel/v4.x/linux-${version}.tar.xz";
-    sha256 = "0rq9cciabw5gfi2z30fcwh6z4zm2fgp938xmblfw59hyjj98h60k";
+    sha256 = "0zpz29hgwdwkil6rakn08bdq77qjcz8q18qlkfc43s84f4fd8s45";
   };
 
   kernelPatches = args.kernelPatches;
diff --git a/pkgs/os-specific/linux/kernel/patches.nix b/pkgs/os-specific/linux/kernel/patches.nix
index 103e2235532..a5de48298e1 100644
--- a/pkgs/os-specific/linux/kernel/patches.nix
+++ b/pkgs/os-specific/linux/kernel/patches.nix
@@ -93,9 +93,9 @@ rec {
   grsecurity_4_4 = throw "grsecurity stable is no longer supported";
 
   grsecurity_testing = grsecPatch
-    { kver   = "4.6.3";
-      grrev  = "201607070721";
-      sha256 = "1858zc77x1qbwwfhjlmffd21w4adsw9f3sycg6bksw2jxrhlzww5";
+    { kver   = "4.6.4";
+      grrev  = "201607112205";
+      sha256 = "16j01qqa7yi5yvli1lkl8ffybhy4697nyi18lbl5329zd09xq2ww";
     };
 
   # This patch relaxes grsec constraints on the location of usermode helpers,