diff --git a/pkgs/applications/networking/cluster/k0sctl/default.nix b/pkgs/applications/networking/cluster/k0sctl/default.nix
index 256d7e64225..b30a7174902 100644
--- a/pkgs/applications/networking/cluster/k0sctl/default.nix
+++ b/pkgs/applications/networking/cluster/k0sctl/default.nix
@@ -1,20 +1,29 @@
 { lib
 , buildGoModule
 , fetchFromGitHub
+, fetchpatch
+, installShellFiles
 }:
 
 buildGoModule rec {
   pname = "k0sctl";
-  version = "0.11.4";
+  version = "0.12.6";
 
   src = fetchFromGitHub {
     owner = "k0sproject";
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256-Fk1aYSa3LqzxiHtlzH5pcNtodOprjfnCFh4UMqCa6Rc=";
+    sha256 = "sha256-TkkMO6xBHY5t5Rpd0ieSDXMrnQ+Xdq+65Rk93ZkYcUs=";
   };
 
-  vendorSha256 = "sha256-21C6wZ8lKQnbUg3aD0ZFVOgopblXyWk4WP/ubZVk3Yk=";
+  vendorSha256 = "sha256-nTAuvHcsJiW0XYX5GM1SL8cnOhwdrj6iw8tuAkEWNzQ=";
+
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/k0sproject/${pname}/commit/22c694ab0335a1e6146d0d3f939ef79d2c005a3d.patch";
+      sha256 = "sha256-Ftq/vbQd5ArdHboDt6NdyuqpFalHVnsQBdpmyDG/t5Q=";
+    })
+  ];
 
   ldflags = [
     "-s"
@@ -23,6 +32,15 @@ buildGoModule rec {
     "-X github.com/k0sproject/k0sctl/version.Version=${version}"
   ];
 
+  nativeBuildInputs = [ installShellFiles ];
+
+  postInstall = ''
+    for shell in bash zsh fish; do
+      installShellCompletion --cmd ${pname} \
+        --$shell <($out/bin/${pname} completion --shell $shell)
+    done
+  '';
+
   meta = with lib; {
     description = "A bootstrapping and management tool for k0s clusters.";
     homepage = "https://k0sproject.io/";