diff --git a/pkgs/os-specific/linux/kernel/xanmod-kernels.nix b/pkgs/os-specific/linux/kernel/xanmod-kernels.nix
index 15c344efbed3..b2c4d0a6a669 100644
--- a/pkgs/os-specific/linux/kernel/xanmod-kernels.nix
+++ b/pkgs/os-specific/linux/kernel/xanmod-kernels.nix
@@ -6,14 +6,14 @@ let
   # NOTE: When updating these, please also take a look at the changes done to
   # kernel config in the xanmod version commit
   ltsVariant = {
-    version = "6.6.32";
-    hash = "sha256-DdBkfDq+bed1WdaAtxX16xjZO10jjqJ74ccY9Wq6ryM=";
+    version = "6.6.33";
+    hash = "sha256-3qGxIYNVm2f69rym0Ya1X497G7yRNj3lLCtVgyEZ9yw=";
     variant = "lts";
   };
 
   mainVariant = {
-    version = "6.8.11";
-    hash = "sha256-nEAUw7qFXab7J6x8coSsoB2meeOX4TQver2WztkFJJI=";
+    version = "6.9.4";
+    hash = "sha256-gY0t77aPWOuRZFESNp0OLIsjLAv+rf0NHbab9WF2VtA=";
     variant = "main";
   };
 
@@ -46,6 +46,14 @@ let
       HZ = freeform "250";
       HZ_250 = yes;
       HZ_1000 = no;
+
+      # RCU_BOOST and RCU_EXP_KTHREAD
+      RCU_EXPERT = yes;
+      RCU_FANOUT = freeform "64";
+      RCU_FANOUT_LEAF = freeform "16";
+      RCU_BOOST = yes;
+      RCU_BOOST_DELAY = freeform "0";
+      RCU_EXP_KTHREAD = yes;
     };
 
     extraMeta = {