diff --git a/nixos/doc/manual/release-notes/rl-2009.xml b/nixos/doc/manual/release-notes/rl-2009.xml
index 97b94c5756a7..8d6bcccb9dae 100644
--- a/nixos/doc/manual/release-notes/rl-2009.xml
+++ b/nixos/doc/manual/release-notes/rl-2009.xml
@@ -525,6 +525,14 @@ systemd.services.nginx.serviceConfig.ReadWritePaths = [ "/var/www" ];
      automatically if <literal>stateVersion</literal> is 20.09 or higher.
     </para>
    </listitem>
+   <listitem>
+    <para>
+      <literal>udpt</literal> experienced a complete rewrite from C++ to rust. The configuration format changed from ini to toml.
+      The new configuration documentation can be found at
+      <link xlink:href="https://naim94a.github.io/udpt/config.html">the official website</link> and example
+      configuration is packaged in <literal>${udpt}/share/udpt/udpt.toml</literal>.
+    </para>
+   </listitem>
    <listitem>
     <para>
      We now have a unified <xref linkend="opt-services.xserver.displayManager.autoLogin"/> option interface
diff --git a/pkgs/servers/udpt/default.nix b/pkgs/servers/udpt/default.nix
index 2849f8c7e743..b807d1f0d267 100644
--- a/pkgs/servers/udpt/default.nix
+++ b/pkgs/servers/udpt/default.nix
@@ -1,45 +1,21 @@
-{ stdenv, fetchFromGitHub, boost, sqlite, cmake, gtest }:
+{ stdenv, rustPlatform, fetchFromGitHub }:
 
-stdenv.mkDerivation {
+rustPlatform.buildRustPackage rec {
   pname = "udpt";
-  version = "2017-09-27";
-
-  enableParallelBuilding = true;
-
-  # Suitable for a network facing daemon.
-  hardeningEnable = [ "pie" ];
+  version = "3.1.0";
 
   src = fetchFromGitHub {
     owner = "naim94a";
     repo = "udpt";
-    rev = "e0dffc83c8ce76b08a41a4abbd5f8065535d534f";
-    sha256 = "187dw96mzgcmh4k9pvfpb7ckbb8d4vlikamr2x8vkpwzgjs3xd6g";
+    rev = "${pname}-${version}";
+    sha256 = "1g6l0y5x9pdra3i1npkm474glysicm4hf2m01700ack2rp43vldr";
   };
 
-  doCheck = true;
+  cargoSha256 = "1cmd80ndjxdmyfjpm1f04rwf64501nyi6wdsj7lxidgd1v92wy2c";
+  verifyCargoDeps = true;
 
-  checkPhase = ''
-    runHook preCheck
-
-    make test
-
-    runHook postCheck
-  '';
-
-  buildInputs = [ boost sqlite cmake gtest ];
-
-  postPatch = ''
-    # Enabling optimization (implied by fortify hardening) causes htons
-    # to be re-defined as a macro, turning this use of :: into a syntax error.
-    sed -i '104a#undef htons' src/udpTracker.cpp
-  '';
-
-  installPhase = ''
-    mkdir -p $out/bin $out/etc/
-    cp udpt $out/bin
-    cp ../udpt.conf $out/etc/
-    # without this, the resulting binary is unstripped.
-    runHook postInstall
+  postInstall = ''
+    install -D udpt.toml $out/share/udpt/udpt.toml
   '';
 
   meta = {