diff --git a/shell.nix b/shell.nix
index 24598169e..762d90849 100644
--- a/shell.nix
+++ b/shell.nix
@@ -17,17 +17,77 @@
 #
 #  $ nix-shell shell.nix --arg disableRiscvToolchain true
 
-{ pkgs ? import <nixpkgs> {}, disableRiscvToolchain ? false }:
+{ pkgs ? import <nixpkgs> {}, disableRiscvToolchain ? false, withUnfreePkgs ? false }:
 
 with builtins;
 let
-  inherit (pkgs) stdenv lib;
+  inherit (pkgs) stdenv stdenvNoCC lib;
+
+  nrf-command-line-tools = stdenvNoCC.mkDerivation {
+    pname = "nrf-command-line-tools";
+    version = "10.22.1";
+
+    src = builtins.fetchurl {
+      url = "https://nsscprodmedia.blob.core.windows.net/prod/software-and-other-downloads/desktop-software/nrf-command-line-tools/sw/versions-10-x-x/10-22-1/nrf-command-line-tools-10.22.1_linux-amd64.tar.gz";
+      sha256 = "sha256:0i3dfhp75rizs7kxyfka166k3zy5hmb28c25377pgnzk6w1yx383";
+    };
+
+    nativeBuildInputs = with pkgs; [
+      autoPatchelfHook
+    ];
+
+    propagatedBuildInputs = with pkgs; [
+      segger-jlink libusb
+    ];
+
+    installPhase = ''
+      mkdir -p $out/
+      cp -r * $out/
+    '';
+  };
+
   pythonPackages = lib.fix' (self: with self; pkgs.python3Packages //
   {
+    siphash = buildPythonPackage rec {
+      pname = "siphash";
+      version = "0.0.1";
+
+      src = fetchPypi {
+        inherit pname version;
+        sha256 = "sha256-rul/6V4JoplYGcBYpeSsbZZmGomNf+CtVeO3LJox1GE=";
+      };
+    };
+
+    pynrfjprog = buildPythonPackage {
+      pname = "pynrfjprog";
+      version = nrf-command-line-tools.version;
+
+      src = nrf-command-line-tools.src;
+
+      preConfigure = ''
+        cd ./python
+      '';
+
+      format = "pyproject";
+
+      nativeBuildInputs = [
+        setuptools
+        pkgs.autoPatchelfHook
+      ];
+
+      buildInputs = [
+        nrf-command-line-tools
+      ];
+
+      propagatedBuildInputs = [
+        tomli-w
+        future
+      ];
+    };
 
     tockloader = buildPythonPackage rec {
       pname = "tockloader";
-      version = "1.9.0";
+      version = "1.10.0";
       name = "${pname}-${version}";
 
       propagatedBuildInputs = [
@@ -38,37 +98,46 @@ let
         toml
         tqdm
         questionary
-      ];
+        pycrypto
+        siphash
+      ] ++ (lib.optional withUnfreePkgs pynrfjprog);
 
       src = fetchPypi {
         inherit pname version;
-        sha256 = "sha256-7W55jugVtamFUL8N3dD1LFLJP2UDQb74V6o96rd/tEg=";
+        sha256 = "sha256-TFOCtrYp0+I5tfj/m5BE+QIIUrQgIFicyzGKF7KJ0HY=";
       };
+
+      # Dependency checks require unfree software
+      doCheck = withUnfreePkgs;
     };
   });
   elf2tab = pkgs.rustPlatform.buildRustPackage rec {
     name = "elf2tab-${version}";
-    version = "0.10.2";
+    version = "0.11.0";
 
     src = pkgs.fetchFromGitHub {
       owner = "tock";
       repo = "elf2tab";
       rev = "v${version}";
-      sha256 = "sha256-mlb94K3mTSGpkP+bFAQd6/AN2cssR+48nreTOym21jU=";
+      sha256 = "sha256-cjDFi9vaD9O2oVtGAapvvHrA+yUe17teoVzTso2enpI=";
     };
 
-    cargoSha256 = "sha256-Dt6iPb7xXD6bvf1GS17xdFhRSm5qd3FfZaJfW0eRBf8=";
+    cargoSha256 = "sha256-KGPp6Dx1aUX8XILfV8kbiXKinoBVkEmBRxD9mWrsVNk=";
   };
 in
   pkgs.mkShell {
     name = "tock-dev";
 
     buildInputs = with pkgs; [
+      nrf-command-line-tools
       elf2tab
       gcc-arm-embedded
       python3Full
       pythonPackages.tockloader
-    ] ++ (lib.optional (!disableRiscvToolchain) (
+    ] ++ (lib.optionals withUnfreePkgs [
+      segger-jlink
+      nrf-command-line-tools
+    ]) ++ (lib.optional (!disableRiscvToolchain) (
       pkgsCross.riscv32-embedded.buildPackages.gcc.override (oldCc: {
         cc = (pkgsCross.riscv32-embedded.buildPackages.gcc.cc.override (oldCcArgs: {
           libcCross = oldCcArgs.libcCross.overrideAttrs (oldNewlibAttrs: {
@@ -93,5 +162,8 @@ in
       ${if (!disableRiscvToolchain) then ''
         export RISCV=1
       '' else ""}
+
+      # TODO: This should be patched into the rpath of the respective libraries!
+      export LD_LIBRARY_PATH=${pkgs.libusb}/lib:${pkgs.segger-jlink}/lib:$LD_LIBRARY_PATH
     '';
   }