diff --git a/pkgs/os-specific/linux/kernel/linux-testing.nix b/pkgs/os-specific/linux/kernel/linux-testing.nix
index 54e37e72130..ed649ed6492 100644
--- a/pkgs/os-specific/linux/kernel/linux-testing.nix
+++ b/pkgs/os-specific/linux/kernel/linux-testing.nix
@@ -1,13 +1,13 @@
 { stdenv, hostPlatform, fetchurl, perl, buildLinux, ... } @ args:
 
 import ./generic.nix (args // rec {
-  version = "4.14-rc8";
-  modDirVersion = "4.14.0-rc8";
-  extraMeta.branch = "4.14";
+  version = "4.15-rc1";
+  modDirVersion = "4.15.0-rc1";
+  extraMeta.branch = "4.15";
 
   src = fetchurl {
     url = "https://git.kernel.org/torvalds/t/linux-${version}.tar.gz";
-    sha256 = "0ir2ggflm1xjnn1kvv2c99m5zni5kg0ygzlpm588wnhkzd93nqjh";
+    sha256 = "1l7c132qb5qjd80hga03ivssfq65brqyd95sb4rd065dqrixp20n";
   };
 
   # Should the testing kernels ever be built on Hydra?
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 69e56aa83a4..b3a510d0a1a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -12600,7 +12600,6 @@ with pkgs;
   linux_testing = callPackage ../os-specific/linux/kernel/linux-testing.nix {
     kernelPatches = [
       kernelPatches.bridge_stp_helper
-      kernelPatches.p9_fixes
       kernelPatches.modinst_arg_list_too_long
     ] ++ lib.optionals ((platform.kernelArch or null) == "mips") [
       kernelPatches.mips_fpureg_emu