1 files changed, 3 insertions, 3 deletions
diff --git a/pkgs/os-specific/linux/kernel/patches.nix b/pkgs/os-specific/linux/kernel/patches.nix
index d8676413e82..0a3b51a4e6e 100644
--- a/pkgs/os-specific/linux/kernel/patches.nix
+++ b/pkgs/os-specific/linux/kernel/patches.nix
@@ -100,9 +100,9 @@ rec {
   };
 
   grsecurity_testing = grsecPatch
-    { kver   = "4.9.20";
-      grrev  = "201703310823";
-      sha512 = "0pm3wmcip73imjjx13yar5l5bhpii45mjac5vb1snypmbwqmywmikiixqslq84i1yqw0c8pi822znkz7650dhxrmdmagy0yirwfdrhf";
+    { kver   = "4.9.21";
+      grrev  = "201704091948";
+      sha512 = "1pa9vchnii319w3jarp4aclyjpwpk2s3ddi9facvy0r148xxqsl30hk2l0ihb9wwr9pz5a8l2z85skkkp65hpaz6fr9wmy9d1lb1hwh";
     };
 
   # This patch relaxes grsec constraints on the location of usermode helpers,