diff --git a/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix b/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix
index a5bea6cf34a9..567a75a31aba 100644
--- a/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix
+++ b/pkgs/applications/networking/browsers/ungoogled-chromium/common.nix
@@ -4,7 +4,7 @@
 , bzip2, flac, speex, libopus
 , libevent, expat, libjpeg, snappy
 , libpng, libcap
-, xdg_utils, yasm, minizip, libwebp
+, xdg_utils, yasm, nasm, minizip, libwebp
 , libusb1, pciutils, nss, re2, zlib
 
 , python2Packages, perl, pkgconfig
@@ -13,10 +13,12 @@
 , bison, gperf
 , glib, gtk3, dbus-glib
 , glibc
+, xorg
 , libXScrnSaver, libXcursor, libXtst, libGLU, libGL
 , protobuf, speechd, libXdamage, cups
 , ffmpeg_3, libxslt, libxml2, at-spi2-core
 , jre
+, pipewire_0_2
 
 # optional dependencies
 , libgcrypt ? null # gnomeSupport || cupsSupport
@@ -74,7 +76,7 @@ let
     in attrs: concatStringsSep " " (attrValues (mapAttrs toFlag attrs));
 
   gnSystemLibraries = [
-    "flac" "libwebp" "libxslt" "yasm" "opus" "snappy" "libpng"
+    "flac" "libwebp" "libxslt" "opus" "snappy" "libpng"
     # "zlib" # version 77 reports unresolved dependency on //third_party/zlib:zlib_config
     # "libjpeg" # fails with multiple undefined references to chromium_jpeg_*
     # "re2" # fails with linker errors
@@ -91,9 +93,10 @@ let
     bzip2 flac speex opusWithCustomModes
     libevent expat libjpeg snappy
     libpng libcap
-    xdg_utils yasm minizip libwebp
+    xdg_utils minizip libwebp
     libusb1 re2 zlib
     ffmpeg_3 libxslt libxml2
+    nasm
     # harfbuzz # in versions over 63 harfbuzz and freetype are being built together
                # so we can't build with one from system and other from source
   ];
@@ -128,8 +131,9 @@ let
     nativeBuildInputs = [
       ninja which python2Packages.python perl pkgconfig
       python2Packages.ply python2Packages.jinja2 nodejs
-      gnutar
-    ] ++ optional (versionAtLeast version "83") python2Packages.setuptools;
+      gnutar python2Packages.setuptools
+      (xorg.xcbproto.override { python = python2Packages.python; })
+    ];
 
     buildInputs = defaultDependencies ++ [
       nspr nss systemd
@@ -139,6 +143,7 @@ let
       libXScrnSaver libXcursor libXtst libGLU libGL
       pciutils protobuf speechd libXdamage at-spi2-core
       jre
+      pipewire_0_2
     ] ++ optional useVaapi libva
       ++ optional gnomeKeyringSupport libgnome-keyring3
       ++ optionals gnomeSupport [ gnome.GConf libgcrypt ]
@@ -161,13 +166,10 @@ let
       #
       # ++ optionals (channel == "dev") [ ( githubPatch "<patch>" "0000000000000000000000000000000000000000000000000000000000000000" ) ]
       # ++ optional (versionRange "68" "72") ( githubPatch "<patch>" "0000000000000000000000000000000000000000000000000000000000000000" )
-    ] ++ optionals (useVaapi) ([ # Fixes for the VA-API build:
+    ] ++ optionals (useVaapi) [ # Improvements for the VA-API build:
       ./patches/enable-vdpau-support-for-nvidia.patch # https://aur.archlinux.org/cgit/aur.git/tree/vdpau-support.patch?h=chromium-vaapi
       ./patches/enable-video-acceleration-on-linux.patch # Can be controlled at runtime (i.e. without rebuilding Chromium)
-    ] ++ optionals (versionRange "81" "82") [
-      (githubPatch "5b2ff215473e0526b5b24aeff4ad90d369b21c75" "0n00vh8wfpn2ay5fqsxcsx0zadnv7mihm72bcvnrfzh75nzbg902")
-      (githubPatch "98e343ab369e4262511b5fce547728e3e5eefba8" "00wwp653jk0k0yvix00vr7ymgck9dj7fxjwx4nc67ynn84dh6064")
-    ]);
+    ];
 
     postPatch = ''
       # We want to be able to specify where the sandbox is via CHROME_DEVEL_SANDBOX
@@ -187,6 +189,11 @@ let
           '/usr/share/locale/' \
           '${glibc}/share/locale/'
 
+      substituteInPlace ui/gfx/x/BUILD.gn \
+        --replace \
+          '/usr/share/xcb' \
+          '${xorg.xcbproto}/share/xcb/'
+
       sed -i -e 's@"\(#!\)\?.*xdg-@"\1${xdg_utils}/bin/xdg-@' \
         chrome/browser/shell_integration_linux.cc
 
@@ -239,7 +246,6 @@ let
     '';
 
     gnFlags = mkGnFlags ({
-      linux_use_bundled_binutils = false;
       use_lld = false;
       use_gold = true;
       gold_path = "${stdenv.cc}/bin";
@@ -257,6 +263,8 @@ let
       # added later in the wrapped -wv build or downloaded from Google.
       enable_widevine = true;
       use_cups = cupsSupport;
+      # Provides the enable-webrtc-pipewire-capturer flag to support Wayland screen capture.
+      rtc_use_pipewire = true;
 
       treat_warnings_as_errors = false;
       is_clang = stdenv.cc.isClang;
diff --git a/pkgs/applications/networking/browsers/ungoogled-chromium/default.nix b/pkgs/applications/networking/browsers/ungoogled-chromium/default.nix
index 4b6c33221827..9051fc55feb4 100644
--- a/pkgs/applications/networking/browsers/ungoogled-chromium/default.nix
+++ b/pkgs/applications/networking/browsers/ungoogled-chromium/default.nix
@@ -1,7 +1,8 @@
 { newScope, config, stdenv, llvmPackages_9, llvmPackages_10
-, makeWrapper, ed
+, makeWrapper, ed, gnugrep
 , glib, gtk3, gnome3, gsettings-desktop-schemas, gn, fetchgit
 , libva ? null
+, pipewire_0_2
 , gcc, nspr, nss, runCommand
 , lib
 
@@ -23,9 +24,7 @@
 }:
 
 let
-  llvmPackages = if channel != "stable"
-    then llvmPackages_10
-    else llvmPackages_9;
+  llvmPackages = llvmPackages_10;
   stdenv = llvmPackages.stdenv;
 
   callPackage = newScope chromium;
@@ -38,8 +37,6 @@ let
     mkChromiumDerivation = callPackage ./common.nix ({
       inherit gnome gnomeSupport gnomeKeyringSupport proprietaryCodecs cupsSupport pulseSupport useOzone;
       inherit ungoogled;
-      gnChromium = gn;
-    } // lib.optionalAttrs (channel != "stable") {
       # TODO: Remove after we can update gn for the stable channel (backward incompatible changes):
       gnChromium = gn.overrideAttrs (oldAttrs: {
         version = "2020-03-23";
@@ -49,6 +46,15 @@ let
           sha256 = "00y2d35wvqmx9glaqhfb62wdgbfpwr77v0934nnvh9ks71vnsjqy";
         };
       });
+    } // lib.optionalAttrs (channel == "dev") {
+      gnChromium = gn.overrideAttrs (oldAttrs: {
+        version = "2020-05-19";
+        src = fetchgit {
+          url = "https://gn.googlesource.com/gn";
+          rev = "d0a6f072070988e7b038496c4e7d6c562b649732";
+          sha256 = "0197msabskgfbxvhzq73gc3wlr3n9cr4bzrhy5z5irbvy05lxk17";
+        };
+      });
     });
 
     browser = callPackage ./browser.nix { inherit channel enableWideVine; };
@@ -140,7 +146,7 @@ let
       (!enableVaapi)
       "--add-flags --disable-accelerated-video-decode --add-flags --disable-accelerated-video-encode";
 in stdenv.mkDerivation {
-  name = "chromium${suffix}-${version}";
+  name = "ungoogled-chromium${suffix}-${version}";
   inherit version;
 
   buildInputs = [
@@ -158,7 +164,7 @@ in stdenv.mkDerivation {
   buildCommand = let
     browserBinary = "${chromiumWV}/libexec/chromium/chromium";
     getWrapperFlags = plugin: "$(< \"${plugin}/nix-support/wrapper-flags\")";
-    libPath = stdenv.lib.makeLibraryPath [ libva ];
+    libPath = stdenv.lib.makeLibraryPath [ libva pipewire_0_2 ];
 
   in with stdenv.lib; ''
     mkdir -p "$out/bin"
@@ -185,7 +191,7 @@ in stdenv.mkDerivation {
   '' + ''
 
     # libredirect causes chromium to deadlock on startup
-    export LD_PRELOAD="\$(echo -n "\$LD_PRELOAD" | tr ':' '\n' | grep -v /lib/libredirect\\\\.so$ | tr '\n' ':')"
+    export LD_PRELOAD="\$(echo -n "\$LD_PRELOAD" | tr ':' '\n' | ${gnugrep}/bin/grep -v /lib/libredirect\\\\.so$ | tr '\n' ':')"
 
     export XDG_DATA_DIRS=$XDG_ICON_DIRS:$GSETTINGS_SCHEMAS_PATH\''${XDG_DATA_DIRS:+:}\$XDG_DATA_DIRS
 
diff --git a/pkgs/applications/networking/browsers/ungoogled-chromium/patches/enable-vdpau-support-for-nvidia.patch b/pkgs/applications/networking/browsers/ungoogled-chromium/patches/enable-vdpau-support-for-nvidia.patch
index b5372d1a2556..8d879de7bfd8 100644
--- a/pkgs/applications/networking/browsers/ungoogled-chromium/patches/enable-vdpau-support-for-nvidia.patch
+++ b/pkgs/applications/networking/browsers/ungoogled-chromium/patches/enable-vdpau-support-for-nvidia.patch
@@ -31,15 +31,6 @@
    // TODO(crbug.com/912295): Enable a better BufferAllocationMode for IMPORT
    // |output_mode_| as well.
    if (output_mode_ == VideoDecodeAccelerator::Config::OutputMode::IMPORT)
-@@ -1105,7 +1113,7 @@ VaapiVideoDecodeAccelerator::DecideBufferAllocationMode() {
-   // depends on the bitstream and sometimes it's not enough to cover the amount
-   // of frames needed by the client pipeline (see b/133733739).
-   // TODO(crbug.com/911754): Enable for VP9 Profile 2.
--  if (IsGeminiLakeOrLater() &&
-+  if (false && IsGeminiLakeOrLater() &&
-       (profile_ == VP9PROFILE_PROFILE0 || profile_ == VP8PROFILE_ANY)) {
-     // Add one to the reference frames for the one being currently egressed, and
-     // an extra allocation for both |client_| and |decoder_|, see
 --- a/media/gpu/vaapi/vaapi_video_decode_accelerator.h
 +++ b/media/gpu/vaapi/vaapi_video_decode_accelerator.h
 @@ -204,6 +204,7 @@ class MEDIA_GPU_EXPORT VaapiVideoDecodeAccelerator
diff --git a/pkgs/applications/networking/browsers/ungoogled-chromium/plugins.nix b/pkgs/applications/networking/browsers/ungoogled-chromium/plugins.nix
index 663d8e7f6b67..54da49b9e301 100644
--- a/pkgs/applications/networking/browsers/ungoogled-chromium/plugins.nix
+++ b/pkgs/applications/networking/browsers/ungoogled-chromium/plugins.nix
@@ -44,11 +44,11 @@ let
 
   flash = stdenv.mkDerivation rec {
     pname = "flashplayer-ppapi";
-    version = "32.0.0.371";
+    version = "32.0.0.403";
 
     src = fetchzip {
       url = "https://fpdownload.adobe.com/pub/flashplayer/pdc/${version}/flash_player_ppapi_linux.x86_64.tar.gz";
-      sha256 = "1nks2wx74b21hv0l7bnrzkxn7c6p6r8zgwbqvy3cqpi8famyr5v9";
+      sha256 = "1xirngiqypylgm8f3ddvny2ghqxgj8i98bm1carcj2vryw53wwal";
       stripRoot = false;
     };
 
diff --git a/pkgs/applications/networking/browsers/ungoogled-chromium/ungoogled-src.nix b/pkgs/applications/networking/browsers/ungoogled-chromium/ungoogled-src.nix
index c393f7fe28ec..109e410d5eef 100644
--- a/pkgs/applications/networking/browsers/ungoogled-chromium/ungoogled-src.nix
+++ b/pkgs/applications/networking/browsers/ungoogled-chromium/ungoogled-src.nix
@@ -1,6 +1,6 @@
 {
-  "81.0.4044.138" = {
-    rev = "81.0.4044.138-1";
-    sha256 = "1qa5lw2psaqxr2zklaldx4sm6by4gsw3mfrp01ijc4kkp9jmvg7r";
+  "84.0.4147.89" = {
+    rev = "84.0.4147.89-1";
+    sha256 = "1bqvcq3dj6615198j7cz3ylyyic5zpis06capvl6ybl1na3ainb0";
   };
 }
diff --git a/pkgs/applications/networking/browsers/ungoogled-chromium/upstream-info.nix b/pkgs/applications/networking/browsers/ungoogled-chromium/upstream-info.nix
index defb58822a03..874e45307ebf 100644
--- a/pkgs/applications/networking/browsers/ungoogled-chromium/upstream-info.nix
+++ b/pkgs/applications/networking/browsers/ungoogled-chromium/upstream-info.nix
@@ -1,18 +1,18 @@
 # This file is autogenerated from update.sh in the same directory.
 {
   beta = {
-    sha256 = "0z9p4v5mkinf7hbdagh4bz6ymqjxg3df3wjpvm201ilzzngmjqz1";
-    sha256bin64 = "1srvlirhnynh0q2a17p8z13p7r54z0cchh1d1h07hqljnwmsf8qj";
-    version = "83.0.4103.34";
+    sha256 = "0yf6j0459qzr677zsa2apmfz0x0ndlscvwj1a5v40nqjijchv5qp";
+    sha256bin64 = "017ix9a74f2gzlg6in0x6fqgiw8bpk0rypr6wsqqkslywprypjd0";
+    version = "84.0.4147.89";
   };
   dev = {
-    sha256 = "178fc112bsbrgj2hss78y8rhnz8hl85fr33gawk9fz88zk5qz7xd";
-    sha256bin64 = "06qra245l2bbgxc3k04aabkgq1qnzybnrjhrjb25vriv31ji36b1";
-    version = "84.0.4128.3";
+    sha256 = "1dbbr7s8vbhxd0sk4k2yqp630zp1r4gzkkd2a86pzlzq2mjhsk8a";
+    sha256bin64 = "0bphfwi6nkj9nzrjjaffiv27xfblgdikyifsbjl6vv2pawkh335q";
+    version = "85.0.4183.15";
   };
   stable = {
-    sha256 = "19kpzmqmld0m0nflx13w9flxfal19msnxhzl3lip1jqih65z4y7l";
-    sha256bin64 = "0sl4wv7npc3rhi7jgn679hi7j5ykzwpx5dahy78h87yfg4fx84wx";
-    version = "81.0.4044.138";
+    sha256 = "0yf6j0459qzr677zsa2apmfz0x0ndlscvwj1a5v40nqjijchv5qp";
+    sha256bin64 = "1hzhgvs2ykqsncpnbnhzh09sw1vlsdfjhs06z5gc80l47brdi3wz";
+    version = "84.0.4147.89";
   };
 }