diff --git a/pkgs/os-specific/linux/kernel/linux-rt-5.6.nix b/pkgs/os-specific/linux/kernel/linux-rt-5.6.nix
deleted file mode 100644
index 7c77454040d5..000000000000
--- a/pkgs/os-specific/linux/kernel/linux-rt-5.6.nix
+++ /dev/null
@@ -1,41 +0,0 @@
-{ lib, buildLinux, fetchurl
-, kernelPatches ? [ ]
-, structuredExtraConfig ? {}
-, extraMeta ? {}
-, argsOverride ? {}
-, ... } @ args:
-
-let
-  version = "5.6.19-rt12"; # updated by ./update-rt.sh
-  branch = lib.versions.majorMinor version;
-  kversion = builtins.elemAt (lib.splitString "-" version) 0;
-in buildLinux (args // {
-  inherit version;
-
-  src = fetchurl {
-    url = "mirror://kernel/linux/kernel/v5.x/linux-${kversion}.tar.xz";
-    sha256 = "1s0yc1138sglbm4vyizl4r7hnc1l7nykdjp4063ad67yayr2ylv2";
-  };
-
-  kernelPatches = let rt-patch = {
-    name = "rt";
-    patch = fetchurl {
-      url = "mirror://kernel/linux/kernel/projects/rt/${branch}/older/patch-${version}.patch.xz";
-      sha256 = "0ia8rx0615x0z2s4ppw1244crg7c5ak07c9n3wbnz7y8bk8hyxws";
-    };
-  }; in [ rt-patch ] ++ lib.remove rt-patch kernelPatches;
-
-  structuredExtraConfig = with lib.kernel; {
-    PREEMPT_RT = yes;
-    # Fix error: unused option: PREEMPT_RT.
-    EXPERT = yes; # PREEMPT_RT depends on it (in kernel/Kconfig.preempt)
-    # Fix error: option not set correctly: PREEMPT_VOLUNTARY (wanted 'y', got 'n').
-    PREEMPT_VOLUNTARY = lib.mkForce no; # PREEMPT_RT deselects it.
-    # Fix error: unused option: RT_GROUP_SCHED.
-    RT_GROUP_SCHED = lib.mkForce (option no); # Removed by sched-disable-rt-group-sched-on-rt.patch.
-  } // structuredExtraConfig;
-
-  extraMeta = extraMeta // {
-    inherit branch;
-  };
-} // argsOverride)
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index fcc22399b69d..6c773a69f33e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -19284,13 +19284,6 @@ in
     ];
   };
 
-  linux-rt_5_6 = callPackage ../os-specific/linux/kernel/linux-rt-5.6.nix {
-    kernelPatches = [
-      kernelPatches.bridge_stp_helper
-      kernelPatches.request_key_helper
-    ];
-  };
-
   linux_5_10 = callPackage ../os-specific/linux/kernel/linux-5.10.nix {
     kernelPatches = [
       kernelPatches.bridge_stp_helper
@@ -19568,7 +19561,6 @@ in
 
   # Realtime kernel packages.
   linuxPackages-rt_5_4 = linuxPackagesFor pkgs.linux-rt_5_4;
-  linuxPackages-rt_5_6 = linuxPackagesFor pkgs.linux-rt_5_6;
   linuxPackages-rt_5_10 = linuxPackagesFor pkgs.linux-rt_5_10;
   linuxPackages-rt = linuxPackages-rt_5_4;
   linuxPackages-rt_latest = linuxPackages-rt_5_10;