diff --git a/third_party/grpc/default.nix b/third_party/grpc/default.nix
index 87ae5d7a3..f8fd1ac89 100644
--- a/third_party/grpc/default.nix
+++ b/third_party/grpc/default.nix
@@ -3,17 +3,8 @@
 (pkgs.grpc.override {
   protobuf = depot.third_party.protobuf;
   stdenv = pkgs.llvmPackages.libcxxStdenv;
+  abseil-cpp = depot.third_party.abseil_cpp;
 }).overrideAttrs(orig: rec {
-  version = "1.30.0";
-
-  src = pkgs.fetchFromGitHub {
-    owner = "grpc";
-    repo = "grpc";
-    rev = "v${version}";
-    sha256 = "01w5jdp318i7ncxbkfv75q0mf0rd3qwfr1ycdd3850nv6mprv7n0";
-    fetchSubmodules = true;
-  };
-
   cmakeFlags = orig.cmakeFlags ++ [
     "-DCMAKE_CXX_STANDARD=17"
     "-DCMAKE_CXX_STANDARD_REQUIRED=ON"
diff --git a/third_party/nix/src/nix-daemon/nix-daemon.cc b/third_party/nix/src/nix-daemon/nix-daemon.cc
index fd7a553e2..0551625a3 100644
--- a/third_party/nix/src/nix-daemon/nix-daemon.cc
+++ b/third_party/nix/src/nix-daemon/nix-daemon.cc
@@ -27,7 +27,7 @@ ABSL_FLAG(bool, pipe, false, "Use pipes for daemon communication");
 namespace nix::daemon {
 
 using grpc::Server;
-using grpc_impl::ServerBuilder;
+using grpc::ServerBuilder;
 
 namespace {
 
diff --git a/third_party/nixpkgs/default.nix b/third_party/nixpkgs/default.nix
index 602d16b2c..86e1f3b31 100644
--- a/third_party/nixpkgs/default.nix
+++ b/third_party/nixpkgs/default.nix
@@ -13,16 +13,16 @@ let
   # nixos-unstable, and the current stable channel of the latest NixOS
   # release.
 
-  # Tracking nixos-unstable as of 2021-03-25.
+  # Tracking nixos-unstable as of 2021-04-09.
   unstableHashes = {
-    commit = "60dd94fb7e01a8288f6638eee71d7cb354c49327";
-    sha256 = "0skdwk9bdld295kzrymirs8xrzycqmhsclaz8s18jhcz75hb8sk3";
+    commit = "9e377a6ce42dccd9b624ae4ce8f978dc892ba0e2";
+    sha256 = "1r3ll77hyqn28d9i4cf3vqd9v48fmaa1j8ps8c4fm4f8gqf4kpl1";
   };
 
-  # Tracking nixos-20.09 as of 2021-03-25.
+  # Tracking nixos-20.09 as of 2021-04-09.
   stableHashes = {
-    commit = "223d0d733a66b46504ea6b4c15f88b7cc4db58fb";
-    sha256 = "073327ris0frqa3kpid3nsjr9w8yx2z83xpsc24w898mrs9r7d5v";
+    commit = "d6f63659a7021051a46035373ed50fbea7e4e924";
+    sha256 = "0vblhzg57sfzqpdm24lgs08vjv2204lzcp6hv4cbjd20rz0mxs4y";
   };
 
   # import the nixos-unstable package set, or optionally use the
diff --git a/third_party/overlays/haskell/default.nix b/third_party/overlays/haskell/default.nix
index 16c250f82..45681194a 100644
--- a/third_party/overlays/haskell/default.nix
+++ b/third_party/overlays/haskell/default.nix
@@ -20,18 +20,6 @@ let
     hashable = doJailbreak hsSuper.hashable;
     test-framework-quickcheck2 = doJailbreak hsSuper.test-framework-quickcheck2;
     pandoc = doJailbreak hsSuper.pandoc;
-
-    # can be removed if we have the following PR or equivalent
-    # https://github.com/NixOS/nixpkgs/pull/116931
-    hedgehog-classes = overrideCabal hsSuper.hedgehog-classes (attrs: {
-      # remove version bound on semirings which is inside a
-      # conditional, so doJailbreak doesn't work
-      prePatch = ''
-        sed -i 's|semirings.*0.6|semirings|g' hedgehog-classes.cabal
-      '';
-    });
-
-    hgeometry-combinatorial = dontCheck hsSuper.hgeometry-combinatorial;
   };
 in {
   haskellPackages = super.haskellPackages.override {
diff --git a/third_party/overlays/tvl.nix b/third_party/overlays/tvl.nix
index 01f7156ff..6c182df7d 100644
--- a/third_party/overlays/tvl.nix
+++ b/third_party/overlays/tvl.nix
@@ -24,4 +24,8 @@ self: super: {
   clang-tools = (super.clang-tools.override {
     llvmPackages = self.llvmPackages_11;
   });
+
+  # Pick an older version of SBCL as the default, to avoid issues with
+  # warnings in newer SBCL.
+  sbcl = super.sbcl_2_0_8;
 }
diff --git a/users/glittershark/pkgs/fprintd/default.nix b/users/glittershark/pkgs/fprintd/default.nix
deleted file mode 100644
index 1a977e34d..000000000
--- a/users/glittershark/pkgs/fprintd/default.nix
+++ /dev/null
@@ -1,130 +0,0 @@
-{ depot, pkgs, ... }:
-
-let
-  nixpkgs = import pkgs.path {
-    config.allowUnfree = true;
-    overlays = [(self: super: {
-      # TODO(grfn): Can we not override this here? It bootstraps
-      # rustc, builds firefox, and many other things.
-      gcc = super.gcc9;
-    })];
-  };
-
-  inherit (nixpkgs)
-    stdenv
-    fetchFromGitLab
-    fetchpatch
-    pkgconfig
-    meson
-    ninja
-    perl
-    gettext
-    cairo
-    gtk-doc
-    libxslt
-    docbook-xsl-nons
-    docbook_xml_dtd_412
-    glib
-    dbus
-    dbus-glib
-    polkit
-    nss
-    pam
-    systemd
-    python3;
-  libfprint-tod = nixpkgs.callPackage ./libfprint-tod.nix {};
-
-in
-
-stdenv.mkDerivation rec {
-  pname = "fprintd";
-  version = "1.90.1";
-  outputs = [ "out" "devdoc" ];
-
-  src = fetchFromGitLab {
-    domain = "gitlab.freedesktop.org";
-    owner = "libfprint";
-    repo = pname;
-    rev = version;
-    sha256 = "0mbzk263x7f58i9cxhs44mrngs7zw5wkm62j5r6xlcidhmfn03cg";
-  };
-
-  patches = [
-    # Fixes issue with ":" when there is multiple paths (might be the case on NixOS)
-    # https://gitlab.freedesktop.org/libfprint/fprintd/-/merge_requests/50
-    (fetchpatch {
-      url = "https://gitlab.freedesktop.org/libfprint/fprintd/-/commit/d7fec03f24d10f88d34581c72f0eef201f5eafac.patch";
-      sha256 = "0f88dhizai8jz7hpm5lpki1fx4593zcy89iwi4brsqbqc7jp9ls0";
-    })
-
-    # Fix locating libpam_wrapper for tests
-    (fetchpatch {
-      url = "https://gitlab.freedesktop.org/libfprint/fprintd/-/merge_requests/40.patch";
-      sha256 = "0qqy090p93lzabavwjxzxaqidkcb3ifacl0d3yh1q7ms2a58yyz3";
-    })
-    (fetchpatch {
-      url = "https://gitlab.freedesktop.org/libfprint/fprintd/-/commit/f401f399a85dbeb2de165b9b9162eb552ab6eea7.patch";
-      sha256 = "1bc9g6kc95imlcdpvp8qgqjsnsxg6nipr6817c1pz5i407yvw1iy";
-    })
-  ];
-
-  nativeBuildInputs = [
-    pkgconfig
-    meson
-    ninja
-    perl
-    gettext
-    gtk-doc
-    libxslt
-    dbus
-    docbook-xsl-nons
-    docbook_xml_dtd_412
-  ];
-
-  buildInputs = [
-    glib
-    dbus-glib
-    polkit
-    nss
-    pam
-    systemd
-    libfprint-tod
-  ];
-
-  checkInputs = with python3.pkgs; [
-    python-dbusmock
-    dbus-python
-    pygobject3
-    pycairo
-    pypamtest
-  ];
-
-  mesonFlags = [
-    "-Dgtk_doc=true"
-    "-Dpam_modules_dir=${placeholder "out"}/lib/security"
-    "-Dsysconfdir=${placeholder "out"}/etc"
-    "-Ddbus_service_dir=${placeholder "out"}/share/dbus-1/system-services"
-    "-Dsystemd_system_unit_dir=${placeholder "out"}/lib/systemd/system"
-  ];
-
-  PKG_CONFIG_DBUS_1_INTERFACES_DIR = "${placeholder "out"}/share/dbus-1/interfaces";
-  PKG_CONFIG_POLKIT_GOBJECT_1_POLICYDIR = "${placeholder "out"}/share/polkit-1/actions";
-  PKG_CONFIG_DBUS_1_DATADIR = "${placeholder "out"}/share";
-
-  # FIXME: Ugly hack for tests to find libpam_wrapper.so
-  LIBRARY_PATH = stdenv.lib.makeLibraryPath [ python3.pkgs.pypamtest ];
-
-  doCheck = true;
-
-  postPatch = ''
-    patchShebangs po/check-translations.sh
-  '';
-
-  meta = with stdenv.lib; {
-    homepage = "https://fprint.freedesktop.org/";
-    description = "D-Bus daemon that offers libfprint functionality over the D-Bus interprocess communication bus";
-    license = licenses.gpl2;
-    platforms = platforms.linux;
-    maintainers = with maintainers; [ abbradar elyhaka ];
-  };
-}
diff --git a/users/glittershark/pkgs/fprintd/libfprint-tod-clean.nix b/users/glittershark/pkgs/fprintd/libfprint-tod-clean.nix
deleted file mode 100644
index d8e64f3cc..000000000
--- a/users/glittershark/pkgs/fprintd/libfprint-tod-clean.nix
+++ /dev/null
@@ -1,81 +0,0 @@
-{ stdenv
-, pkgs
-, fetchFromGitLab
-, fetchurl
-, pkgconfig
-, meson
-, ninja
-, libusb
-, gusb
-, pixman
-, gobject-introspection
-, glib
-, nss
-, gtk3
-, python3
-, umockdev
-, coreutils
-, gtk-doc
-, docbook_xsl
-, docbook_xml_dtd_43
-}:
-
-stdenv.mkDerivation rec {
-  pname = "libfprint-tod-clean";
-  version = "1.90.2";
-  outputs = [ "out" "devdoc" ];
-
-  src = fetchFromGitLab {
-    domain = "gitlab.freedesktop.org";
-    owner = "3v1n0";
-    repo = "libfprint";
-    rev = "0e123d0752538d834ee2cca8b471373369ad5e89";
-    sha256 = "11yl3nikdyykamafqf3ys1wg7zx3rb81lf11ndd8sf9rkwwfgpn6";
-  };
-
-  checkInputs = [ (python3.withPackages (ps: with ps; [ pycairo gobject ])) umockdev ];
-
-  nativeBuildInputs = [
-    pkgconfig
-    meson
-    gobject-introspection
-    ninja
-    gtk-doc
-    docbook_xsl
-    docbook_xml_dtd_43
-  ];
-
-  buildInputs = [
-    libusb
-    gusb
-    pixman
-    glib
-    nss
-    gtk3
-  ];
-
-  mesonFlags = [
-    "-Dudev_rules_dir=${placeholder "out"}/lib/udev/rules.d"
-    "-Dx11-examples=false"
-  ];
-
-  doChecks = true;
-
-  checkPhase = ''
-    meson test -C build --print-errorlogs
-  '';
-
-  postPatch = ''
-    substituteInPlace libfprint/meson.build \
-      --replace /bin/echo ${coreutils}/bin/echo
-  '';
-
-
-  meta = with stdenv.lib; {
-    homepage = https://fprint.freedesktop.org/;
-    description = "A library designed to make it easy to add support for consumer fingerprint readers";
-    license = licenses.lgpl21;
-    platforms = platforms.linux;
-    maintainers = with maintainers; [ jobojeha ];
-  };
-}
diff --git a/users/glittershark/pkgs/fprintd/libfprint-tod-goodix.nix b/users/glittershark/pkgs/fprintd/libfprint-tod-goodix.nix
deleted file mode 100644
index f6d7d4ea9..000000000
--- a/users/glittershark/pkgs/fprintd/libfprint-tod-goodix.nix
+++ /dev/null
@@ -1,47 +0,0 @@
-{ stdenv
-, pkgs
-, fetchgit
-, libfprint-tod ? (pkgs.callPackage ./libfprint-tod-clean.nix {})
-, git
-, autoPatchelfHook
-, libusb
-, glibc
-,
-}:
-stdenv.mkDerivation rec {
-  pname = "libfprint-2-tod1-xps9300-bin";
-  version = "0.0.6";
-
-  src = fetchgit {
-    url = "git://git.launchpad.net/~oem-solutions-engineers/libfprint-2-tod1-goodix/+git/libfprint-2-tod1-goodix/";
-    rev = "882735c6366fbe30149eea5cfd6d0ddff880f0e4";
-    sha256 = "1x9h5x027s2avdhjhnfmmhdpgyf9x79fz8skcjd3rm3phnpr3zsj";
-  };
-
-  buildInputs = [
-    libfprint-tod
-    git
-    libusb
-    autoPatchelfHook
-    glibc
-  ];
-
-  installPhase = ''
-    install -dm 755 "$out/lib/udev/rules.d/"
-    install -dm 755 "$out/usr/lib/libfprint-2/tod-1/"
-
-    sed -n -r '/Shenzhen/,/^\s*$/p' debian/copyright > LICENSE
-    install -Dm644 LICENSE "$out/usr/share/licenses/libfprint-2-tod1-xps9300-bin/LICENSE"
-
-    install -Dm 755 usr/lib/x86_64-linux-gnu/libfprint-2/tod-1/libfprint-tod-goodix-53xc-0.0.6.so "$out/usr/lib/libfprint-2/tod-1/"
-    install -Dm 0755 lib/udev/rules.d/60-libfprint-2-tod1-goodix.rules "$out/lib/udev/rules.d/"
-  '';
-
-  meta = with stdenv.lib; {
-    homepage = "https://git.launchpad.net/~oem-solutions-engineers/libfprint-2-tod1-goodix/+git/libfprint-2-tod1-goodix";
-    description = "Goodix driver module for libfprint-2 Touch OEM Driver";
-    license = licenses.unfreeRedistributable;
-    platforms = platforms.linux;
-    maintainers = with maintainers; [ jobojeha ];
-  };
-}
diff --git a/users/glittershark/pkgs/fprintd/libfprint-tod.nix b/users/glittershark/pkgs/fprintd/libfprint-tod.nix
deleted file mode 100644
index d9c87e673..000000000
--- a/users/glittershark/pkgs/fprintd/libfprint-tod.nix
+++ /dev/null
@@ -1,89 +0,0 @@
-{ stdenv
-, pkgs
-, fetchFromGitLab
-, fetchurl
-, pkgconfig
-, meson
-, ninja
-, libusb
-, gusb
-, pixman
-, gobject-introspection
-, glib
-, nss
-, gtk3
-, python3
-, umockdev
-, coreutils
-, gtk-doc
-, docbook_xsl
-, docbook_xml_dtd_43
-, libfprint-tod-goodix ? (pkgs.callPackage ./libfprint-tod-goodix.nix {})
-}:
-
-stdenv.mkDerivation rec {
-  pname = "libfprint-tod";
-  version = "1.90.2";
-  outputs = [ "out" "devdoc" ];
-
-  src = fetchFromGitLab {
-    domain = "gitlab.freedesktop.org";
-    owner = "3v1n0";
-    repo = "libfprint";
-    rev = "0e123d0752538d834ee2cca8b471373369ad5e89";
-    sha256 = "11yl3nikdyykamafqf3ys1wg7zx3rb81lf11ndd8sf9rkwwfgpn6";
-  };
-
-  checkInputs = [ (python3.withPackages (ps: with ps; [ pycairo gobject ])) umockdev ];
-
-  nativeBuildInputs = [
-    pkgconfig
-    meson
-    gobject-introspection
-    ninja
-    gtk-doc
-    docbook_xsl
-    docbook_xml_dtd_43
-  ];
-
-  buildInputs = [
-    libusb
-    gusb
-    pixman
-    glib
-    nss
-    gtk3
-    libfprint-tod-goodix
-  ];
-
-  mesonFlags = [
-    "-Dudev_rules_dir=${placeholder "out"}/lib/udev/rules.d"
-    "-Dx11-examples=false"
-  ];
-
-  doChecks = true;
-
-  checkPhase = ''
-    meson test -C build --print-errorlogs
-  '';
-
-  postPatch = ''
-    substituteInPlace libfprint/meson.build \
-      --replace /bin/echo ${coreutils}/bin/echo
-  '';
-
-  postInstall = ''
-    mkdir -p $out/lib/libfprint-2/tod-1/
-    ln -s ${libfprint-tod-goodix}/usr/lib/libfprint-2/tod-1/libfprint-tod-goodix-53xc-0.0.6.so $out/lib/libfprint-2/tod-1/
-    ln -s ${libfprint-tod-goodix}/lib/udev/rules.d/60-libfprint-2-tod1-goodix.rules $out/lib/udev/rules.d/
-
-  '';
-
-  meta = with stdenv.lib; {
-    homepage = https://fprint.freedesktop.org/;
-    description = "A library designed to make it easy to add support for consumer fingerprint readers";
-    license = licenses.lgpl21;
-    platforms = platforms.linux;
-    maintainers = with maintainers; [ jobojeha ];
-  };
-}
diff --git a/users/glittershark/system/system/machines/yeren.nix b/users/glittershark/system/system/machines/yeren.nix
index 444ea91e8..7bb06716f 100644
--- a/users/glittershark/system/system/machines/yeren.nix
+++ b/users/glittershark/system/system/machines/yeren.nix
@@ -85,16 +85,14 @@
     intel-media-driver
   ];
 
-  # the fprintd module hardcodes pkgs.fprintd :'(
-  nixpkgs.overlays = [(_: _: {
-    fprintd = depot.users.glittershark.pkgs.fprintd;
-  })];
-
   services.fprintd = {
     enable = true;
-    package = depot.users.glittershark.pkgs.fprintd;
+    package = pkgs.fprintd-tod;
   };
 
+  systemd.services.fprintd.environment.FP_TOD_DRIVERS_DIR =
+    "${pkgs.libfprint-2-tod1-goodix}/usr/lib/libfprint-2/tod-1";
+
   security.pam.loginLimits = [
     {
       domain = "grfn";
diff --git a/users/tazjin/nixos/frog/default.nix b/users/tazjin/nixos/frog/default.nix
index 35d58147d..7f709da7e 100644
--- a/users/tazjin/nixos/frog/default.nix
+++ b/users/tazjin/nixos/frog/default.nix
@@ -39,9 +39,11 @@ in lib.fix(self: {
       "kernel.perf_event_paranoid" = -1;
     };
 
-    kernelPatches = [
-      depot.third_party.kernelPatches.trx40_usb_audio
-    ];
+    # Enable this again if frog is put back into use ...
+    #
+    # kernelPatches = [
+    #   depot.third_party.kernelPatches.trx40_usb_audio
+    # ];
   };
 
   hardware = {
@@ -239,7 +241,6 @@ in lib.fix(self: {
       emacs27 # mostly for emacsclient
       exa
       fd
-      ffmpeg-full
       file
       gdb
       gnupg
@@ -254,7 +255,6 @@ in lib.fix(self: {
       jq
       kubectl
       linuxPackages.perf
-      # lutris
       manpages
       miller
       msmtp
@@ -272,12 +272,10 @@ in lib.fix(self: {
       pmutils
       pwgen
       ripgrep
-      rr
       rustup
       screen
       scrot
       spotify
-      steam
       tokei
       transmission
       tree
@@ -290,6 +288,10 @@ in lib.fix(self: {
       yubico-piv-tool
       yubikey-personalization
       zoxide
+
+      # Commented out because of interim breakage:
+      # steam
+      # lutris
     ]);
 
   # ... and other nonsense.