diff --git a/nix/home-manager/configuration/graphical-fullblown.nix b/nix/home-manager/configuration/graphical-fullblown.nix
index 64dfa02..0a8c378 100644
--- a/nix/home-manager/configuration/graphical-fullblown.nix
+++ b/nix/home-manager/configuration/graphical-fullblown.nix
@@ -133,6 +133,7 @@ in {
       hunspellDicts.de-de
 
       # Messaging/Communication
+      signal-desktop
       pidgin
       hexchat
       aspellDicts.en
@@ -150,7 +151,6 @@ in {
       (pkgs.lib.hiPrio qemu)
       # virtualbox
       vagrant
-      rkt
       docker_compose
       # unstablepkgs.kubernetes
       unstablepkgs.minikube
@@ -346,6 +346,8 @@ in {
       unstablepkgs.swagger-codegen
 
       # Misc Desktop Tools
+      # TODO: this may be required if brightness control isn't working
+      # brightnessctl
       ltunify
       # solaar # TODO: conflicts with solar over udev rules
       dex
diff --git a/nix/home-manager/profiles/qtile-desktop.nix b/nix/home-manager/profiles/qtile-desktop.nix
index f563181..fa90bde 100644
--- a/nix/home-manager/profiles/qtile-desktop.nix
+++ b/nix/home-manager/profiles/qtile-desktop.nix
@@ -259,7 +259,8 @@ in {
 
   services = {
     gnome-keyring.enable = true;
-    blueman-applet.enable = true;
+    # TODO: this has been broken for a while, removing for now.
+    # blueman-applet.enable = true;
     screen-locker = {
       enable = true;
       inactiveInterval = 7;
@@ -273,6 +274,7 @@ in {
       enableScDaemon = true;
       enableSshSupport = true;
       grabKeyboardAndMouse = true;
+      extraConfig = "pinentry-program ${pkgs.pinentry-gtk2}/bin/pinentry";
     };
     flameshot.enable = true;
   };
@@ -281,6 +283,7 @@ in {
     enable = true;
     windowManager.command = "${pkgs.qtile}/bin/qtile -c ${qtileConfig}";
     initExtra = ''
+      ${pkgs.xinput}/bin/xinput set-prop "ErgoDox EZ ErgoDox EZ Mouse" "libinput Natural Scrolling Enabled"
       ${pkgs.autorandr}/bin/autorandr -c
       ${pkgs.feh}/bin/feh --bg-scale ${pkgs.nixos-artwork.wallpapers.simple-blue}/share/artwork/gnome/nix-wallpaper-simple-blue.png
     '';
diff --git a/nix/os/devices/steveej-t480s-work/hw.nix b/nix/os/devices/steveej-t480s-work/hw.nix
index a5ed9af..1390696 100644
--- a/nix/os/devices/steveej-t480s-work/hw.nix
+++ b/nix/os/devices/steveej-t480s-work/hw.nix
@@ -31,6 +31,4 @@ in
     options kvm-intel enable_apicv=1
     options kvm-intel ept=1
   '';
-
-  hardware.brightnessctl.enable = false;
 }
diff --git a/nix/os/devices/steveej-t480s-work/versions.nix b/nix/os/devices/steveej-t480s-work/versions.nix
index 1dabb6a..ce37a40 100644
--- a/nix/os/devices/steveej-t480s-work/versions.nix
+++ b/nix/os/devices/steveej-t480s-work/versions.nix
@@ -1,16 +1,16 @@
 {
   channelsNixosStable = {
-    ref = "nixos-19.09";
-    rev = "8731aaaf8b30888bc24994096db830993090d7c4";
+    ref = "nixos-20.03";
+    rev = "dbacfa172f9a6399f180bcd0aef7998fdec0d55a";
   };
   channelsNixosUnstable = {
     ref = "nixos-unstable";
-    rev = "8130f3c1c2bb0e533b5e150c39911d6e61dcecc2";
+    rev = "82b54d490663b6d87b7b34b9cfc0985df8b49c7d";
   };
   nixpkgsMaster = {
     url = "https://github.com/NixOS/nixpkgs/";
     ref = "master";
-    rev = "329102c47bd1c68f0acdf4feec64232202948c7a";
+    rev = "a1bcb3a83ffdd3b50063a24e6d490c69455268ee";
   };
   homeManagerModule = {
     url = "https://github.com/rycee/home-manager";
diff --git a/nix/os/profiles/common/system.nix b/nix/os/profiles/common/system.nix
index b00e912..a8e26c0 100644
--- a/nix/os/profiles/common/system.nix
+++ b/nix/os/profiles/common/system.nix
@@ -30,9 +30,9 @@
   '';
 
   # Fonts, I18N, Date ...
-  fonts = {
-    enableCoreFonts = true;
-  };
+  fonts.fonts = [
+    pkgs.corefonts
+  ];
 
   i18n = {
     consoleFont = "lat9w-16";
@@ -52,12 +52,15 @@
     ln -sfT ${pkgs.bash}/bin/bash /bin/.bash
     mv -Tf /bin/.bash /bin/bash
   '';
-  system.activationScripts.etcX11sessinos = ''
-    echo "setting up /etc/X11/sessions..."
-    mkdir -p /etc/X11
-    ln -sfT ${config.services.xserver.displayManager.session.desktops} /etc/X11/.sessions
-    mv -Tf /etc/X11/.sessions /etc/X11/sessions
-  '';
+
+  # TODO: find out if this workaround is still required from nixos 20.03 onwards
+  # system.activationScripts.etcX11sessinos = ''
+  #   echo "setting up /etc/X11/sessions..."
+  #   mkdir -p /etc/X11
+  #   ln -sfT ${config.services.xserver.displayManager.session.desktops} /etc/X11/.sessions
+  #   mv -Tf /etc/X11/.sessions /etc/X11/sessions
+  # '';
+
   system.activationScripts.lib64 = ''
     echo "setting up /lib64..."
     mkdir -p /lib64
diff --git a/nix/pkgs/default.nix b/nix/pkgs/default.nix
index f1c275a..fabac52 100644
--- a/nix/pkgs/default.nix
+++ b/nix/pkgs/default.nix
@@ -64,7 +64,6 @@ in rec {
     });
 
   duplicacy = pkgs.callPackage ../pkgs/duplicacy {};
-  just = pkgs.callPackage ../pkgs/just.nix {};
   mfcl3770cdw = pkgs.callPackage ../pkgs/mfcl3770cdw.nix {};
   staruml = pkgs.callPackage ../pkgs/staruml.nix { inherit (pkgs.gnome2) GConf; libgcrypt = pkgs.libgcrypt_1_5; };
 }
diff --git a/nix/pkgs/just.nix b/nix/pkgs/just.nix
deleted file mode 100644
index 24b37a0..0000000
--- a/nix/pkgs/just.nix
+++ /dev/null
@@ -1,26 +0,0 @@
-{ rustPlatform
-, stdenv
-, fetchFromGitHub
-, callPackage
-, bash
-}:
-
-let
-  naersk = callPackage (import (fetchFromGitHub {
-    owner = "nmattia";
-    repo = "naersk";
-    rev = "b3b328b088009972e6844f57c97807f6090fa004";
-    sha256 = "152fl2c174zisl2bcky7xspwhc2s8ys2qdv6nvfhqav5x1rbngbp";
-  })) {};
-
-in
-  naersk.buildPackage rec {
-    version = "5acc112a9749063a554e3626a6055bb88f093468";
-
-    src = builtins.fetchGit {
-      url = "https://github.com/casey/just.git";
-      rev = version;
-    };
-    doDoc = false;
-    doCheck = false;
-  }
diff --git a/nix/variables/versions.tmpl.nix b/nix/variables/versions.tmpl.nix
index 08c7589..08c03dc 100644
--- a/nix/variables/versions.tmpl.nix
+++ b/nix/variables/versions.tmpl.nix
@@ -1,7 +1,7 @@
 {
   channelsNixosStable = {
-    ref = "nixos-19.09";
-    rev = "<% git ls-remote https://github.com/nixos/nixpkgs-channels nixos-19.09 | awk '{ print $1 }' | tr -d '\n' -%>";
+    ref = "nixos-20.03";
+    rev = "<% git ls-remote https://github.com/nixos/nixpkgs-channels nixos-20.03 | awk '{ print $1 }' | tr -d '\n' -%>";
   };
   channelsNixosUnstable = {
     ref = "nixos-unstable";
diff --git a/shell.nix b/shell.nix
index 2ece22a..be78033 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,7 +1,7 @@
 { ... }:
 
 let
-  channels-nixos-stable-path = (builtins.fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/7e88992a8c7b2de0bcb89182d8686b27bd93e46a.tar.gz);
+  channels-nixos-stable-path = (builtins.fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/dbacfa172f9a6399f180bcd0aef7998fdec0d55a.tar.gz);
   channels-nixos-stable = import channels-nixos-stable-path { overlays = builtins.attrValues (import ./nix/overlays); };
 
 in