diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 18911044579..ea73a4251f0 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -240,7 +240,7 @@ let
       FANOTIFY        = yes;
       TMPFS           = yes;
       TMPFS_POSIX_ACL = yes;
-      FS_ENCRYPTION   = { optional = true; tristate = whenAtLeast "4.9" "m"; };
+      FS_ENCRYPTION   = if (versionAtLeast version "5.1") then yes else whenAtLeast "4.9" (option module);
 
       EXT2_FS_XATTR     = yes;
       EXT2_FS_POSIX_ACL = yes;
diff --git a/pkgs/os-specific/linux/kernel/linux-testing.nix b/pkgs/os-specific/linux/kernel/linux-testing.nix
index 375a71789be..80f43ccb964 100644
--- a/pkgs/os-specific/linux/kernel/linux-testing.nix
+++ b/pkgs/os-specific/linux/kernel/linux-testing.nix
@@ -1,13 +1,13 @@
 { stdenv, buildPackages, fetchurl, perl, buildLinux, libelf, utillinux, ... } @ args:
 
 buildLinux (args // rec {
-  version = "5.0-rc8";
-  modDirVersion = "5.0.0-rc8";
-  extraMeta.branch = "5.0";
+  version = "5.1-rc2";
+  modDirVersion = "5.1.0-rc2";
+  extraMeta.branch = "5.1";
 
   src = fetchurl {
     url = "https://git.kernel.org/torvalds/t/linux-${version}.tar.gz";
-    sha256 = "1i58jljwc2y58ggahmh5643h3nckf3k00d0qnni4s9z1xw3w143p";
+    sha256 = "10x6d550cqyj7ipn2q13m03x5vnwv90wgs6532r8fnd86rkygmqb";
   };
 
   # Should the testing kernels ever be built on Hydra?