diff --git a/pkgs/applications/misc/cherrytree/default.nix b/pkgs/applications/misc/cherrytree/default.nix
index 61150d56fbbd..5802f21a8749 100644
--- a/pkgs/applications/misc/cherrytree/default.nix
+++ b/pkgs/applications/misc/cherrytree/default.nix
@@ -13,7 +13,6 @@
 , sqlite
 , curl
 , libuchardet
-, fmt
 , spdlog
 }:
 
@@ -44,7 +43,6 @@ stdenv.mkDerivation rec {
     sqlite
     curl
     libuchardet
-    fmt
     spdlog
   ];
 
diff --git a/pkgs/applications/misc/far2l/default.nix b/pkgs/applications/misc/far2l/default.nix
index 87eaed975352..3e74d04c5128 100644
--- a/pkgs/applications/misc/far2l/default.nix
+++ b/pkgs/applications/misc/far2l/default.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, fetchFromGitHub, makeWrapper, cmake, pkg-config, wxGTK30, glib, pcre, m4, bash
 , xdg-utils, gvfs, zip, unzip, gzip, bzip2, gnutar, p7zip, xz, imagemagick
-, libuchardet, spdlog, xercesc, fmt, openssl, libssh, samba, neon, libnfs, libarchive }:
+, libuchardet, spdlog, xercesc, openssl, libssh, samba, neon, libnfs, libarchive }:
 
 stdenv.mkDerivation rec {
   pname = "far2l";
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake pkg-config m4 makeWrapper imagemagick ];
 
-  buildInputs = [ wxGTK30 glib pcre libuchardet spdlog xercesc fmt ] # base requirements of the build
+  buildInputs = [ wxGTK30 glib pcre libuchardet spdlog xercesc ] # base requirements of the build
     ++ [ openssl libssh samba neon libnfs libarchive ]; # optional feature packages, like protocol support for Network panel, or archive formats
     #++ lib.optional stdenv.isDarwin Cocoa # Mac support -- disabled, see "meta.broken" below
 
diff --git a/pkgs/applications/misc/waybar/default.nix b/pkgs/applications/misc/waybar/default.nix
index a38c1002a01f..38ea7c909c05 100644
--- a/pkgs/applications/misc/waybar/default.nix
+++ b/pkgs/applications/misc/waybar/default.nix
@@ -10,7 +10,6 @@
 , gtkmm3
 , libsigcxx
 , jsoncpp
-, fmt
 , scdoc
 , spdlog
 , gtk-layer-shell
@@ -51,7 +50,7 @@ stdenv.mkDerivation rec {
   strictDeps = false;
 
   buildInputs = with lib;
-    [ wayland wlroots gtkmm3 libsigcxx jsoncpp fmt spdlog gtk-layer-shell howard-hinnant-date libxkbcommon ]
+    [ wayland wlroots gtkmm3 libsigcxx jsoncpp spdlog gtk-layer-shell howard-hinnant-date libxkbcommon ]
     ++ optional  traySupport  libdbusmenu-gtk3
     ++ optional  pulseSupport libpulseaudio
     ++ optional  sndioSupport sndio
diff --git a/pkgs/applications/networking/instant-messengers/nheko/default.nix b/pkgs/applications/networking/instant-messengers/nheko/default.nix
index b097864af431..ffd04fd829ed 100644
--- a/pkgs/applications/networking/instant-messengers/nheko/default.nix
+++ b/pkgs/applications/networking/instant-messengers/nheko/default.nix
@@ -18,7 +18,6 @@
 , mtxclient
 , boost17x
 , spdlog
-, fmt
 , olm
 , pkg-config
 , nlohmann_json
@@ -52,7 +51,6 @@ mkDerivation rec {
     libsecret
     lmdb
     spdlog
-    fmt
     cmark
     qtbase
     qtmultimedia
diff --git a/pkgs/applications/networking/irc/tiny/default.nix b/pkgs/applications/networking/irc/tiny/default.nix
index 253143d00047..fde521c53d58 100644
--- a/pkgs/applications/networking/irc/tiny/default.nix
+++ b/pkgs/applications/networking/irc/tiny/default.nix
@@ -10,21 +10,16 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "tiny";
-  version = "0.9.0";
+  version = "0.10.0";
 
   src = fetchFromGitHub {
     owner = "osa1";
     repo = pname;
     rev = "v${version}";
-    sha256 = "gKyHR3FZHDybaP38rqB8/gvr8T+mDO4QQxoTtWS+TlE=";
+    sha256 = "177d1x4z0mh0p7c5ldq70cn1j3pac50d8cil2ni50hl49c3x6yy1";
   };
 
-  cargoSha256 = "0ChfW8vaqC2kCp4lpS0HOvhuihPw9G5TOmgwKzVDfws=";
-
-  # Fix Cargo.lock version. Remove with the next release.
-  cargoPatches = [
-    ./fix-Cargo.lock.patch
-  ];
+  cargoSha256 = "05q3f1wp48mwkz8n0102rwb6jzrgpx3dlbxzf3zcw8r1mblgzim1";
 
   cargoBuildFlags = lib.optionals stdenv.isLinux [ "--features=desktop-notifications" ];
 
@@ -34,7 +29,7 @@ rustPlatform.buildRustPackage rec {
   meta = with lib; {
     description = "A console IRC client";
     homepage = "https://github.com/osa1/tiny";
-    changelog = "https://github.com/osa1/tiny/blob/v${version}/CHANGELOG.md";
+    changelog = "https://github.com/osa1/tiny/raw/v${version}/CHANGELOG.md";
     license = licenses.mit;
     maintainers = with maintainers; [ Br1ght0ne vyp ];
   };
diff --git a/pkgs/applications/networking/irc/tiny/fix-Cargo.lock.patch b/pkgs/applications/networking/irc/tiny/fix-Cargo.lock.patch
deleted file mode 100644
index 71bc4709bece..000000000000
--- a/pkgs/applications/networking/irc/tiny/fix-Cargo.lock.patch
+++ /dev/null
@@ -1,13 +0,0 @@
-diff --git a/Cargo.lock b/Cargo.lock
-index 3a184dc..0e58cb1 100644
---- a/Cargo.lock
-+++ b/Cargo.lock
-@@ -1023,7 +1023,7 @@ dependencies = [
- 
- [[package]]
- name = "tiny"
--version = "0.8.0"
-+version = "0.9.0"
- dependencies = [
-  "clap",
-  "dirs 3.0.1",
diff --git a/pkgs/applications/networking/mailreaders/notmuch/default.nix b/pkgs/applications/networking/mailreaders/notmuch/default.nix
index a618a696d0fe..df5c9de29d17 100644
--- a/pkgs/applications/networking/mailreaders/notmuch/default.nix
+++ b/pkgs/applications/networking/mailreaders/notmuch/default.nix
@@ -11,11 +11,11 @@
 
 stdenv.mkDerivation rec {
   pname = "notmuch";
-  version = "0.34";
+  version = "0.34.1";
 
   src = fetchurl {
     url = "https://notmuchmail.org/releases/notmuch-${version}.tar.xz";
-    sha256 = "1dk16xa9q7adp1jaswxvw4p92f4h5mg0zkrh3zv8gqxn88amisc3";
+    sha256 = "05nq64gp8vnrwrl22d60v7ixgdhm9339ajhcdfkq0ll1qiycyyj5";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/applications/science/electronics/hal-hardware-analyzer/default.nix b/pkgs/applications/science/electronics/hal-hardware-analyzer/default.nix
index b30a18931213..f1d34062d2aa 100644
--- a/pkgs/applications/science/electronics/hal-hardware-analyzer/default.nix
+++ b/pkgs/applications/science/electronics/hal-hardware-analyzer/default.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, fetchFromGitHub, cmake, ninja, pkg-config, python3Packages
 , boost, rapidjson, qtbase, qtsvg, igraph, spdlog, wrapQtAppsHook
-, fmt, graphviz, llvmPackages, z3
+, graphviz, llvmPackages, z3
 }:
 
 stdenv.mkDerivation rec {
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   '';
 
   nativeBuildInputs = [ cmake ninja pkg-config ];
-  buildInputs = [ qtbase qtsvg boost rapidjson igraph spdlog fmt graphviz wrapQtAppsHook z3 ]
+  buildInputs = [ qtbase qtsvg boost rapidjson igraph spdlog graphviz wrapQtAppsHook z3 ]
     ++ (with python3Packages; [ python pybind11 ])
     ++ lib.optional stdenv.cc.isClang llvmPackages.openmp;
 
diff --git a/pkgs/applications/science/machine-learning/vowpal-wabbit/default.nix b/pkgs/applications/science/machine-learning/vowpal-wabbit/default.nix
index 7ecbe09f5e18..7e9b322b4157 100644
--- a/pkgs/applications/science/machine-learning/vowpal-wabbit/default.nix
+++ b/pkgs/applications/science/machine-learning/vowpal-wabbit/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, cmake, boost, flatbuffers, fmt, rapidjson, spdlog, zlib }:
+{ lib, stdenv, fetchFromGitHub, cmake, boost, flatbuffers, rapidjson, spdlog, zlib }:
 
 stdenv.mkDerivation rec {
   pname = "vowpal-wabbit";
@@ -16,7 +16,6 @@ stdenv.mkDerivation rec {
   buildInputs = [
     boost
     flatbuffers
-    fmt
     rapidjson
     spdlog
     zlib
diff --git a/pkgs/applications/video/kodi/unwrapped.nix b/pkgs/applications/video/kodi/unwrapped.nix
index 7221e668f4e1..5fa652de0c7e 100644
--- a/pkgs/applications/video/kodi/unwrapped.nix
+++ b/pkgs/applications/video/kodi/unwrapped.nix
@@ -16,7 +16,7 @@
 , libcec, libcec_platform, dcadec, libuuid
 , libcrossguid, libmicrohttpd
 , bluez, doxygen, giflib, glib, harfbuzz, lcms2, libidn, libpthreadstubs, libtasn1
-, libplist, p11-kit, zlib, flatbuffers, fmt, fstrcmp, rapidjson
+, libplist, p11-kit, zlib, flatbuffers, fstrcmp, rapidjson
 , lirc
 , x11Support ? true, libX11, xorgproto, libXt, libXmu, libXext, libXinerama, libXrandr, libXtst, libXfixes, xdpyinfo, libXdmcp
 , dbusSupport ? true, dbus
@@ -125,7 +125,7 @@ in stdenv.mkDerivation {
       libgcrypt libgpg-error libunistring
       libcrossguid libplist
       bluez giflib glib harfbuzz lcms2 libpthreadstubs
-      ffmpeg flatbuffers fmt fstrcmp rapidjson
+      ffmpeg flatbuffers fstrcmp rapidjson
       lirc
       mesa # for libEGL
     ]
diff --git a/pkgs/data/themes/ayu-theme-gtk/default.nix b/pkgs/data/themes/ayu-theme-gtk/default.nix
new file mode 100644
index 000000000000..2e8453b097dd
--- /dev/null
+++ b/pkgs/data/themes/ayu-theme-gtk/default.nix
@@ -0,0 +1,68 @@
+{ stdenv
+, autoreconfHook
+, fetchFromGitHub
+, gnome
+, gtk-engine-murrine
+, gtk3
+, inkscape
+, lib
+, optipng
+, pkg-config
+, sassc
+}:
+
+stdenv.mkDerivation rec {
+  pname = "ayu-theme-gtk";
+  version = "unstable-2017-05-12";
+
+  src = fetchFromGitHub {
+    owner = "dnordstrom";
+    repo = "ayu-theme";
+    rev = "cc6f3d3b72897c304e2f00afcaf51df863155e35";
+    sha256 = "sha256-1EhTfPhYl+4IootTCCE04y6V7nW1/eWdHarfF7/j1U0=";
+  };
+
+  postPatch = ''
+    ln -sn 3.20 common/gtk-3.0/3.24
+    ln -sn 3.18 common/gnome-shell/3.24
+  '';
+
+  nativeBuildInputs = [
+    autoreconfHook
+    gtk3
+    inkscape
+    optipng
+    pkg-config
+    sassc
+  ];
+
+  propagatedUserEnvPkgs = [
+    gnome.gnome-themes-extra
+    gtk-engine-murrine
+  ];
+
+  enableParallelBuilding = true;
+
+  preBuild = ''
+    # Shut up inkscape's warnings about creating profile directory
+    export HOME="$NIX_BUILD_ROOT"
+  '';
+
+  configureFlags = [
+    "--with-gnome-shell=${gnome.gnome-shell.version}"
+    "--disable-unity"
+  ];
+
+  postInstall = ''
+    install -Dm644 -t $out/share/doc/${pname} AUTHORS *.md
+  '';
+
+  meta = with lib; {
+    description = "Ayu colored GTK and Kvantum themes based on Arc";
+    homepage = "https://github.com/dnordstrom/ayu-theme/";
+    license = licenses.gpl3;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ lovesegfault ];
+  };
+}
+
diff --git a/pkgs/development/libraries/spdlog/default.nix b/pkgs/development/libraries/spdlog/default.nix
index d21477d806e1..d4e0888ffd2f 100644
--- a/pkgs/development/libraries/spdlog/default.nix
+++ b/pkgs/development/libraries/spdlog/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, cmake, fmt }:
+{ lib, stdenv, fetchFromGitHub, cmake, fmt_8 }:
 
 let
   generic = { version, sha256 }:
@@ -15,7 +15,7 @@ let
 
       nativeBuildInputs = [ cmake ];
       # spdlog <1.3 uses a bundled version of fmt
-      propagatedBuildInputs = lib.optional (lib.versionAtLeast version "1.3") fmt;
+      propagatedBuildInputs = lib.optional (lib.versionAtLeast version "1.3") fmt_8;
 
       cmakeFlags = [
         "-DSPDLOG_BUILD_SHARED=${if stdenv.hostPlatform.isStatic then "OFF" else "ON"}"
@@ -49,8 +49,8 @@ let
 in
 {
   spdlog_1 = generic {
-    version = "1.8.5";
-    sha256 = "sha256-D29jvDZQhPscaOHlrzGN1s7/mXlcsovjbqYpXd7OM50=";
+    version = "1.9.2";
+    sha256 = "sha256-GSUdHtvV/97RyDKy8i+ticnSlQCubGGWHg4Oo+YAr8Y=";
   };
 
   spdlog_0 = generic {
diff --git a/pkgs/development/python-modules/pyemby/default.nix b/pkgs/development/python-modules/pyemby/default.nix
index 81c015df35cb..d197b62b21e9 100644
--- a/pkgs/development/python-modules/pyemby/default.nix
+++ b/pkgs/development/python-modules/pyemby/default.nix
@@ -7,13 +7,13 @@
 
 buildPythonPackage rec {
   pname = "pyemby";
-  version = "1.7";
+  version = "1.8";
 
   src = fetchFromGitHub {
     owner = "mezz64";
     repo = pname;
     rev = version;
-    sha256 = "04fvpv3fz4q160s4ikldwxflxl1zbxgfgy9qs6grgpnd23p0ylk8";
+    sha256 = "sha256-EpmXdyKtfb/M8rTv6YrfNCpDmKei2AD5DBcdVvqCVWw=";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/qiskit-aer/default.nix b/pkgs/development/python-modules/qiskit-aer/default.nix
index 89041f7508df..141eba29f314 100644
--- a/pkgs/development/python-modules/qiskit-aer/default.nix
+++ b/pkgs/development/python-modules/qiskit-aer/default.nix
@@ -8,7 +8,6 @@
 , catch2
 , cmake
 , cython
-, fmt
 , muparserx
 , ninja
 , nlohmann_json
@@ -66,7 +65,6 @@ buildPythonPackage rec {
   buildInputs = [
     blas
     catch2
-    fmt
     muparserx
     nlohmann_json
     spdlog
diff --git a/pkgs/development/tools/build-managers/bear/default.nix b/pkgs/development/tools/build-managers/bear/default.nix
index a81a57235408..552cb0573665 100644
--- a/pkgs/development/tools/build-managers/bear/default.nix
+++ b/pkgs/development/tools/build-managers/bear/default.nix
@@ -7,7 +7,6 @@
 , openssl
 , nlohmann_json
 , gtest
-, fmt
 , spdlog
 , c-ares
 , abseil-cpp
@@ -35,7 +34,6 @@ stdenv.mkDerivation rec {
     openssl
     nlohmann_json
     gtest
-    fmt
     spdlog
     c-ares
     abseil-cpp
diff --git a/pkgs/servers/gerbera/default.nix b/pkgs/servers/gerbera/default.nix
index cd70bd352a73..368f2f494151 100644
--- a/pkgs/servers/gerbera/default.nix
+++ b/pkgs/servers/gerbera/default.nix
@@ -4,7 +4,6 @@
 , cmake
 , pkg-config
   # required
-, fmt
 , libiconv
 , libupnp
 , libuuid
@@ -88,7 +87,6 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake pkg-config ];
 
   buildInputs = [
-    fmt
     libiconv
     libupnp'
     libuuid
diff --git a/pkgs/tools/filesystems/lizardfs/default.nix b/pkgs/tools/filesystems/lizardfs/default.nix
index a9e0cd12d9d4..aa2260cb374d 100644
--- a/pkgs/tools/filesystems/lizardfs/default.nix
+++ b/pkgs/tools/filesystems/lizardfs/default.nix
@@ -17,7 +17,6 @@
 , judy
 , pam
 , spdlog
-, fmt
 , systemdMinimal
 , zlib # optional
 }:
@@ -37,7 +36,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     db fuse asciidoc libxml2 libxslt docbook_xml_dtd_412 docbook_xsl
-    zlib boost judy pam spdlog fmt python3 systemdMinimal
+    zlib boost judy pam spdlog python3 systemdMinimal
   ];
 
   meta = with lib; {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4d5249755b24..975f59739990 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -22774,6 +22774,8 @@ with pkgs;
 
   aurulent-sans = callPackage ../data/fonts/aurulent-sans { };
 
+  ayu-theme-gtk = callPackage ../data/themes/ayu-theme-gtk { };
+
   b612  = callPackage ../data/fonts/b612 { };
 
   babelstone-han = callPackage ../data/fonts/babelstone-han { };