diff --git a/pkgs/by-name/ch/chameleon-cli/package.nix b/pkgs/by-name/ch/chameleon-cli/package.nix
index 4b2264e7475a..1c69248c8b98 100644
--- a/pkgs/by-name/ch/chameleon-cli/package.nix
+++ b/pkgs/by-name/ch/chameleon-cli/package.nix
@@ -4,8 +4,10 @@
   fetchFromGitHub,
   cmake,
   makeWrapper,
+  openssl,
   xz,
   python3,
+  nix-update-script,
 }:
 
 let
@@ -21,18 +23,16 @@ in
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "chameleon-cli";
-  version = "2.1.0-unstable-2025-10-13";
+  version = "2.1.0-unstable-2026-02-06";
 
   src = fetchFromGitHub {
     owner = "RfidResearchGroup";
     repo = "ChameleonUltra";
-    rev = "97dfe5b9a41a6ea5535c6842afbe420098c4844b";
-    sparseCheckout = [ "software" ];
-    hash = "sha256-zFExh0vhzNcf02izgO4P4cWq3LoQpEHb4ZW7hsHZqNA=";
+    rev = "2c7c3eeb4df8eee7451aff7c5ddae5d10cd0c34d";
+    rootDir = "software";
+    hash = "sha256-5QlJGmUjJKWc7e53zMXNoNXTBhwpepThKn9xMKpF16s=";
   };
 
-  sourceRoot = "${finalAttrs.src.name}/software";
-
   postPatch = ''
     substituteInPlace src/CMakeLists.txt \
       --replace-fail "liblzma" "lzma" \
@@ -45,6 +45,7 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   buildInputs = [
+    openssl
     xz
   ];
 
@@ -67,7 +68,12 @@ stdenv.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
-  passthru.updateScript = ./update.sh;
+  passthru.updateScript = nix-update-script {
+    extraArgs = [
+      "--version=branch"
+      "--version-regex=v(.*)"
+    ];
+  };
 
   meta = {
     description = "Command line interface for Chameleon Ultra";
diff --git a/pkgs/by-name/ch/chameleon-cli/update.sh b/pkgs/by-name/ch/chameleon-cli/update.sh
deleted file mode 100755
index 2875b72ffacd..000000000000
--- a/pkgs/by-name/ch/chameleon-cli/update.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash -p coreutils nix-update
-
-# This update script exists, because nix-update is unable to ignore `dev`
-# tags that exist on the upstream repo.
-#
-# Once https://github.com/Mic92/nix-update/issues/322 is resolved it can be
-# removed.
-
-set -exuo pipefail
-
-cd "$(git rev-parse --show-toplevel)"
-
-nix-update --version=branch chameleon-cli
-
-tag=$(git ls-remote --tags --refs --sort='-version:refname' https://github.com/RfidResearchGroup/ChameleonUltra.git 'v*' | head -n 1 | cut --delimiter=/ --field=3-)
-tag="${tag#v}"
-sed -i -e 's|version = "[^-]*-unstable-|version = "'"${tag}"'-unstable-|' pkgs/by-name/ch/chameleon-cli/package.nix