diff --git a/.editorconfig b/.editorconfig
index 43970edebe5..f3489267888 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -105,6 +105,9 @@ insert_final_newline = unset
 indent_size = unset
 trim_trailing_whitespace = unset
 
+[pkgs/tools/misc/timidity/timidity.cfg]
+trim_trailing_whitespace = unset
+
 [pkgs/top-level/emscripten-packages.nix]
 trim_trailing_whitespace = unset
 
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index cb0264b0167..fd2a6073df6 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -55,7 +55,7 @@ Follow these steps to backport a change into a release branch in compliance with
 1. Take note of the commits in which the change was introduced into `master` branch.
 2. Check out the target _release branch_, e.g. `release-20.03`. Do not use a _channel branch_ like `nixos-20.03` or `nixpkgs-20.03`.
 3. Create a branch for your change, e.g. `git checkout -b backport`.
-4. When the reason to backport is not obvious from the original commit message, use `git cherry-pick -xe <original commit>` and add a reason. Otherwise use `git cherry-pick -x <original commit>`. That's fine for minor version updates that only include security and bug fixes, commits that fixes an otherwise broken package or similar.
+4. When the reason to backport is not obvious from the original commit message, use `git cherry-pick -xe <original commit>` and add a reason. Otherwise use `git cherry-pick -x <original commit>`. That's fine for minor version updates that only include security and bug fixes, commits that fixes an otherwise broken package or similar. Please also ensure the commits exists on the master branch; in the case of squashed or rebased merges, the commit hash will change and the new commits can be found in the merge message at the bottom of the master pull request.
 5. Push to GitHub and open a backport pull request. Make sure to select the release branch (e.g. `release-20.03`) as the target branch of the pull request, and link to the pull request in which the original change was comitted to `master`. The pull request title should be the commit title with the release version as prefix, e.g. `[20.03]`.
 
 ## Reviewing contributions
diff --git a/flake.nix b/flake.nix
index e7c04417ac8..8440c460b16 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,7 +5,6 @@
 
   outputs = { self }:
     let
-
       jobs = import ./pkgs/top-level/release.nix {
         nixpkgs = self;
       };
@@ -28,10 +27,31 @@
       lib = lib.extend (final: prev: {
         nixosSystem = { modules, ... } @ args:
           import ./nixos/lib/eval-config.nix (args // {
-            modules = modules ++
-              [ { system.nixos.versionSuffix =
+            modules =
+              let
+                vmConfig = (import ./nixos/lib/eval-config.nix
+                  (args // {
+                    modules = modules ++ [ ./nixos/modules/virtualisation/qemu-vm.nix ];
+                  })).config;
+
+                vmWithBootLoaderConfig = (import ./nixos/lib/eval-config.nix
+                  (args // {
+                    modules = modules ++ [
+                      ./nixos/modules/virtualisation/qemu-vm.nix
+                      { virtualisation.useBootLoader = true; }
+                    ];
+                  })).config;
+              in
+              modules ++ [
+                {
+                  system.nixos.versionSuffix =
                     ".${final.substring 0 8 (self.lastModifiedDate or self.lastModified)}.${self.shortRev or "dirty"}";
                   system.nixos.revision = final.mkIf (self ? rev) self.rev;
+
+                  system.build = {
+                    vm = vmConfig.system.build.vm;
+                    vmWithBootLoader = vmWithBootLoaderConfig.system.build.vm;
+                  };
                 }
               ];
           });
diff --git a/nixos/modules/installer/tools/nixos-rebuild.sh b/nixos/modules/installer/tools/nixos-rebuild.sh
index ad40fd2811d..909e8b229c8 100644
--- a/nixos/modules/installer/tools/nixos-rebuild.sh
+++ b/nixos/modules/installer/tools/nixos-rebuild.sh
@@ -438,15 +438,17 @@ if [ -z "$rollback" ]; then
         if [[ -z $flake ]]; then
             pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vm -k "${extraBuildFlags[@]}")"
         else
-            echo "$0: 'build-vm' is not supported with '--flake'" >&2
-            exit 1
+            nix "${flakeFlags[@]}" build "$flake#$flakeAttr.config.system.build.vm" \
+              "${extraBuildFlags[@]}" "${lockFlags[@]}"
+            pathToConfig="$(readlink -f ./result)"
         fi
     elif [ "$action" = build-vm-with-bootloader ]; then
         if [[ -z $flake ]]; then
             pathToConfig="$(nixBuild '<nixpkgs/nixos>' -A vmWithBootLoader -k "${extraBuildFlags[@]}")"
         else
-            echo "$0: 'build-vm-with-bootloader' is not supported with '--flake'" >&2
-            exit 1
+            nix "${flakeFlags[@]}" build "$flake#$flakeAttr.config.system.build.vmWithBootLoader" \
+              "${extraBuildFlags[@]}" "${lockFlags[@]}"
+            pathToConfig="$(readlink -f ./result)"
         fi
     else
         showSyntax
diff --git a/pkgs/applications/audio/sunvox/default.nix b/pkgs/applications/audio/sunvox/default.nix
index 48ad9bc971c..2cd48806f7d 100644
--- a/pkgs/applications/audio/sunvox/default.nix
+++ b/pkgs/applications/audio/sunvox/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "http://www.warmplace.ru/soft/sunvox/sunvox-${version}.zip";
-    sha256 = "15pyc3dk4dqlivgzki8sv7xpwg3bbn5xv9338g16a0dbn7s3kich";
+    sha256 = "04f7psm0lvc09nw7d2wp0sncf37bym2v7hhxp4v8c8gdgayj7k8m";
   };
 
   buildInputs = [ unzip ];
diff --git a/pkgs/applications/editors/emacs-modes/melpa-packages.nix b/pkgs/applications/editors/emacs-modes/melpa-packages.nix
index c48e342977e..03e9923f737 100644
--- a/pkgs/applications/editors/emacs-modes/melpa-packages.nix
+++ b/pkgs/applications/editors/emacs-modes/melpa-packages.nix
@@ -196,6 +196,26 @@ let
 
         ivy-rtags = fix-rtags super.ivy-rtags;
 
+        libgit = super.libgit.overrideAttrs(attrs: {
+          nativeBuildInputs = (attrs.nativeBuildInputs or []) ++ [ pkgs.cmake ];
+          buildInputs = attrs.buildInputs ++ [ pkgs.libgit2 ];
+          dontUseCmakeBuildDir = true;
+          postPatch = ''
+            sed -i s/'add_subdirectory(libgit2)'// CMakeLists.txt
+          '';
+          postBuild = ''
+            pushd working/libgit
+            make
+            popd
+          '';
+          postInstall = ''
+            outd=$(echo $out/share/emacs/site-lisp/elpa/libgit-**)
+            mkdir $outd/build
+            install -m444 -t $outd/build ./source/src/libegit2.so
+            rm -r $outd/src $outd/Makefile $outd/CMakeLists.txt
+          '';
+        });
+
         magit = super.magit.overrideAttrs (attrs: {
           # searches for Git at build time
           nativeBuildInputs =
diff --git a/pkgs/applications/misc/qcad/default.nix b/pkgs/applications/misc/qcad/default.nix
index ad3c884f25e..a0d370c00ac 100644
--- a/pkgs/applications/misc/qcad/default.nix
+++ b/pkgs/applications/misc/qcad/default.nix
@@ -1,12 +1,16 @@
 { boost
 , fetchFromGitHub
+, libGLU
 , mkDerivationWith
 , muparser
 , pkgconfig
+, qtbase
 , qmake
-, qt5
+, qtscript
+, qtsvg
+, qtxmlpatterns
+, qttools
 , stdenv
-, libGLU
 }:
 
 mkDerivationWith stdenv.mkDerivation rec {
@@ -25,11 +29,11 @@ mkDerivationWith stdenv.mkDerivation rec {
   ];
 
   postPatch = ''
-    if ! [ -d src/3rdparty/qt-labs-qtscriptgenerator-${qt5.qtbase.version} ]; then
-      mkdir src/3rdparty/qt-labs-qtscriptgenerator-${qt5.qtbase.version}
+    if ! [ -d src/3rdparty/qt-labs-qtscriptgenerator-${qtbase.version} ]; then
+      mkdir src/3rdparty/qt-labs-qtscriptgenerator-${qtbase.version}
       cp \
         src/3rdparty/qt-labs-qtscriptgenerator-5.14.0/qt-labs-qtscriptgenerator-5.14.0.pro \
-        src/3rdparty/qt-labs-qtscriptgenerator-${qt5.qtbase.version}/qt-labs-qtscriptgenerator-${qt5.qtbase.version}.pro
+        src/3rdparty/qt-labs-qtscriptgenerator-${qtbase.version}/qt-labs-qtscriptgenerator-${qtbase.version}.pro
     fi
  '';
 
@@ -63,7 +67,7 @@ mkDerivationWith stdenv.mkDerivation rec {
 
     # workaround to fix the library browser:
     rm -r $out/lib/plugins/sqldrivers
-    ln -s -t $out/lib/plugins ${qt5.qtbase}/${qt5.qtbase.qtPluginPrefix}/sqldrivers
+    ln -s -t $out/lib/plugins ${qtbase}/${qtbase.qtPluginPrefix}/sqldrivers
 
     install -Dm644 scripts/qcad_icon.svg $out/share/icons/hicolor/scalable/apps/qcad.svg
 
@@ -74,16 +78,16 @@ mkDerivationWith stdenv.mkDerivation rec {
     boost
     muparser
     libGLU
-    qt5.qtbase
-    qt5.qtscript
-    qt5.qtsvg
-    qt5.qtxmlpatterns
+    qtbase
+    qtscript
+    qtsvg
+    qtxmlpatterns
   ];
 
   nativeBuildInputs = [
     pkgconfig
-    qt5.qmake
-    qt5.qttools
+    qmake
+    qttools
   ];
 
   enableParallelBuilding = true;
@@ -93,6 +97,6 @@ mkDerivationWith stdenv.mkDerivation rec {
     homepage = "https://qcad.org";
     license = licenses.gpl3;
     maintainers = with maintainers; [ yvesf ];
-    platforms = qt5.qtbase.meta.platforms;
+    platforms = qtbase.meta.platforms;
   };
 }
diff --git a/pkgs/applications/version-management/git-and-tools/git-machete/default.nix b/pkgs/applications/version-management/git-and-tools/git-machete/default.nix
index 2e1c790348e..cbb69403531 100644
--- a/pkgs/applications/version-management/git-and-tools/git-machete/default.nix
+++ b/pkgs/applications/version-management/git-and-tools/git-machete/default.nix
@@ -4,11 +4,11 @@
 
 buildPythonApplication rec {
   pname = "git-machete";
-  version = "2.15.5";
+  version = "2.15.6";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "11an0hwva1jlf9y7vd9mscs4g6lzja1rwizsani6411xs6m121a3";
+    sha256 = "0ajb3m3i3pfc5v3gshglk7qphk1rpniwx8q8isgx1a6cyarzr9bd";
   };
 
   nativeBuildInputs = [ installShellFiles pbr ];
diff --git a/pkgs/build-support/dotnetenv/build-solution.nix b/pkgs/build-support/dotnetenv/build-solution.nix
index 62370d361cd..57af1fe9bd4 100644
--- a/pkgs/build-support/dotnetenv/build-solution.nix
+++ b/pkgs/build-support/dotnetenv/build-solution.nix
@@ -16,20 +16,20 @@ assert modifyPublicMain -> mainClassFile != null;
 
 stdenv.mkDerivation {
   inherit name src;
-  
-  buildInputs = [ dotnetfx ];  
+
+  buildInputs = [ dotnetfx ];
 
   preConfigure = ''
     cd ${baseDir}
   '';
-  
+
   preBuild = ''
     ${stdenv.lib.optionalString modifyPublicMain ''
       sed -i -e "s|static void Main|public static void Main|" ${mainClassFile}
     ''}
     ${preBuild}
   '';
-  
+
   installPhase = ''
     addDeps()
     {
@@ -39,44 +39,44 @@ stdenv.mkDerivation {
 	    do
 		windowsPath=$(cygpath --windows $i)
 		assemblySearchPaths="$assemblySearchPaths;$windowsPath"
-		
+
 		addDeps $i
 	    done
 	fi
     }
-    
+
     for i in ${toString assemblyInputs}
     do
-	windowsPath=$(cygpath --windows $i) 
+	windowsPath=$(cygpath --windows $i)
 	echo "Using assembly path: $windowsPath"
-	
+
 	if [ "$assemblySearchPaths" = "" ]
 	then
 	    assemblySearchPaths="$windowsPath"
 	else
 	    assemblySearchPaths="$assemblySearchPaths;$windowsPath"
 	fi
-	
+
 	addDeps $i
     done
-      
+
     echo "Assembly search paths are: $assemblySearchPaths"
-    
+
     if [ "$assemblySearchPaths" != "" ]
     then
 	echo "Using assembly search paths args: $assemblySearchPathsArg"
 	export AssemblySearchPaths=$assemblySearchPaths
     fi
-    
+
     mkdir -p $out
     MSBuild.exe ${toString slnFile} /nologo /t:${targets} /p:IntermediateOutputPath=$(cygpath --windows $out)\\ /p:OutputPath=$(cygpath --windows $out)\\ /verbosity:${verbosity} ${options}
-    
+
     # Because .NET assemblies store strings as UTF-16 internally, we cannot detect
     # hashes. Therefore a text files containing the proper paths is created
     # We can also use this file the propagate transitive dependencies.
-    
+
     mkdir -p $out/nix-support
-    
+
     for i in ${toString assemblyInputs}
     do
         echo $i >> $out/nix-support/dotnet-assemblies
diff --git a/pkgs/build-support/dotnetenv/default.nix b/pkgs/build-support/dotnetenv/default.nix
index 781a5ba8c0e..c7145504eb7 100644
--- a/pkgs/build-support/dotnetenv/default.nix
+++ b/pkgs/build-support/dotnetenv/default.nix
@@ -10,7 +10,7 @@ let dotnetenv =
   buildWrapper = import ./wrapper.nix {
     inherit dotnetenv;
   };
-  
+
   inherit (dotnetfx) assembly20Path wcfPath referenceAssembly30Path referenceAssembly35Path;
 };
 in
diff --git a/pkgs/build-support/dotnetenv/wrapper.nix b/pkgs/build-support/dotnetenv/wrapper.nix
index 4b07fc27dcb..423303c3084 100644
--- a/pkgs/build-support/dotnetenv/wrapper.nix
+++ b/pkgs/build-support/dotnetenv/wrapper.nix
@@ -36,25 +36,25 @@ dotnetenv.buildSolution {
 	    do
 		windowsPath=$(cygpath --windows $i | sed 's|\\|\\\\|g')
 		assemblySearchArray="$assemblySearchArray @\"$windowsPath\""
-		
+
 		addRuntimeDeps $i
 	    done
 	fi
     }
-    
+
     export exePath=$(cygpath --windows $(find ${application} -name \*.exe) | sed 's|\\|\\\\|g')
-    
+
     # Generate assemblySearchPaths string array contents
     for path in ${toString assemblyInputs}
     do
         assemblySearchArray="$assemblySearchArray @\"$(cygpath --windows $path | sed 's|\\|\\\\|g')\", "
 	addRuntimeDeps $path
     done
-    
+
     sed -e "s|@ROOTNAMESPACE@|${namespace}Wrapper|" \
         -e "s|@ASSEMBLYNAME@|${namespace}|" \
         Wrapper/Wrapper.csproj.in > Wrapper/Wrapper.csproj
-    
+
     sed -e "s|@NAMESPACE@|${namespace}|g" \
         -e "s|@MAINCLASSNAME@|${mainClassName}|g" \
 	-e "s|@EXEPATH@|$exePath|g" \
diff --git a/pkgs/development/libraries/vmmlib/default.nix b/pkgs/development/libraries/vmmlib/default.nix
index 21c186a6732..f191a976437 100644
--- a/pkgs/development/libraries/vmmlib/default.nix
+++ b/pkgs/development/libraries/vmmlib/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, cmake, pkgconfig, boost, blas
+{ stdenv, fetchFromGitHub, cmake, pkgconfig, boost, lapack
 , Accelerate, CoreGraphics, CoreVideo
 }:
 
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
   ];
 
   nativeBuildInputs = [ pkgconfig cmake ];
-  buildInputs = [ boost blas ]
+  buildInputs = [ boost lapack ]
     ++ stdenv.lib.optionals stdenv.isDarwin [ Accelerate CoreGraphics CoreVideo ];
 
   enableParallelBuilding = true;
@@ -30,11 +30,11 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "A vector and matrix math library implemented using C++ templates";
 
-    longDescription = ''vmmlib is a vector and matrix math library implemented 
-            using C++ templates. Its basic functionality includes a vector 
-            and a matrix class, with additional functionality for the 
+    longDescription = ''vmmlib is a vector and matrix math library implemented
+            using C++ templates. Its basic functionality includes a vector
+            and a matrix class, with additional functionality for the
             often-used 3d and 4d vectors and 3x3 and 4x4 matrices.
-            More advanced functionality include solvers, frustum 
+            More advanced functionality include solvers, frustum
             computations and frustum culling classes, and spatial data structures'';
 
     license     = licenses.bsd2;
@@ -43,4 +43,3 @@ stdenv.mkDerivation rec {
     platforms   = platforms.all;
   };
 }
-
diff --git a/pkgs/development/python-modules/cfn-lint/default.nix b/pkgs/development/python-modules/cfn-lint/default.nix
index f18e307c61c..b79bf761317 100644
--- a/pkgs/development/python-modules/cfn-lint/default.nix
+++ b/pkgs/development/python-modules/cfn-lint/default.nix
@@ -1,28 +1,34 @@
 { lib
 , buildPythonPackage
-, fetchPypi
+, fetchFromGitHub
 , pythonOlder
-, pyyaml
-, six
-, requests
 , aws-sam-translator
 , importlib-metadata
 , importlib-resources
 , jsonpatch
 , jsonschema
-, pathlib2
-, setuptools
 , junit-xml
 , networkx
+, pathlib2
+, pyyaml
+, requests
+, setuptools
+, six
+# Test inputs
+, pytestCheckHook
+, mock
+, pydot
 }:
 
 buildPythonPackage rec {
   pname = "cfn-lint";
-  version = "0.35.0";
+  version = "0.35.1";
 
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "42023d89520e3a29891ec2eb4c326eef9d1f7516fe9abee8b6c97ce064187b45";
+  src = fetchFromGitHub {
+    owner = "aws-cloudformation";
+    repo  = "cfn-python-lint";
+    rev = "v${version}";
+    sha256 = "1ajb0412hw9fg9m4b3xbpfbp8cixmnpjxrkaks6k749xinzsv7qk";
   };
 
   postPatch = ''
@@ -30,20 +36,18 @@ buildPythonPackage rec {
   '';
 
   propagatedBuildInputs = [
-    pyyaml
-    six
-    requests
     aws-sam-translator
     jsonpatch
     jsonschema
-    pathlib2
-    setuptools
     junit-xml
     networkx
+    pathlib2
+    pyyaml
+    requests
+    setuptools
+    six
   ] ++ lib.optionals (pythonOlder "3.8") [ importlib-metadata importlib-resources ];
 
-  # No tests included in archive
-  doCheck = false;
   pythonImportsCheck = [
     "cfnlint"
     "cfnlint.conditions"
@@ -60,9 +64,13 @@ buildPythonPackage rec {
     "cfnlint.transform"
   ];
 
+  checkInputs = [ pytestCheckHook mock pydot ];
+  preCheck = "export PATH=$out/bin:$PATH";
+
   meta = with lib; {
     description = "Checks cloudformation for practices and behaviour that could potentially be improved";
     homepage = "https://github.com/aws-cloudformation/cfn-python-lint";
+    changelog = "https://github.com/aws-cloudformation/cfn-python-lint/blob/master/CHANGELOG.md";
     license = licenses.mit;
   };
 }
diff --git a/pkgs/development/python-modules/netaddr/default.nix b/pkgs/development/python-modules/netaddr/default.nix
index 200392c85f8..95f567a6c0c 100644
--- a/pkgs/development/python-modules/netaddr/default.nix
+++ b/pkgs/development/python-modules/netaddr/default.nix
@@ -1,41 +1,32 @@
 { stdenv
 , buildPythonPackage
 , fetchPypi
-, pytest
-, fetchpatch
+, pythonOlder
 , glibcLocales
+, importlib-resources
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
   pname = "netaddr";
-  version = "0.7.19";
+  version = "0.8.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "38aeec7cdd035081d3a4c306394b19d677623bf76fa0913f6695127c7753aefd";
+    sha256 = "0hx2npi0wnhwlcybilgwlddw6qffx1mb7a3sj4p9s7bvl33mgk6n";
   };
 
   LC_ALL = "en_US.UTF-8";
-  checkInputs = [ glibcLocales pytest ];
 
-  checkPhase = ''
-    # fails on python3.7: https://github.com/drkjam/netaddr/issues/182
-    py.test \
-      -k 'not test_ip_splitter_remove_prefix_larger_than_input_range' \
-      netaddr/tests
-  '';
+  propagatedBuildInputs = stdenv.lib.optionals (pythonOlder "3.7") [ importlib-resources ];
 
-  patches = [
-    (fetchpatch {
-      url = "https://github.com/drkjam/netaddr/commit/2ab73f10be7069c9412e853d2d0caf29bd624012.patch";
-      sha256 = "0s1cdn9v5alpviabhcjmzc0m2pnpq9dh2fnnk2x96dnry1pshg39";
-    })
-  ];
+  checkInputs = [ glibcLocales pytestCheckHook ];
 
   meta = with stdenv.lib; {
-    homepage = "https://github.com/drkjam/netaddr/";
+    homepage = "https://netaddr.readthedocs.io/en/latest/";
+    downloadPage = "https://github.com/netaddr/netaddr/releases";
+    changelog = "https://netaddr.readthedocs.io/en/latest/changes.html";
     description = "A network address manipulation library for Python";
     license = licenses.mit;
   };
-
 }
diff --git a/pkgs/development/python-modules/pyspice/default.nix b/pkgs/development/python-modules/pyspice/default.nix
new file mode 100644
index 00000000000..f2cce09c8b3
--- /dev/null
+++ b/pkgs/development/python-modules/pyspice/default.nix
@@ -0,0 +1,51 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, libngspice
+, numpy
+, ply
+, scipy
+, pyyaml
+, cffi
+, requests
+, matplotlib
+, setuptools
+}:
+
+buildPythonPackage rec {
+  pname = "PySpice";
+  version = "1.4.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0mnyy8nr06d1al99kniyqcm0p9a8dvkg719s42sajl8yf51sayc9";
+  };
+
+  propagatedBuildInputs = [
+    setuptools
+    requests
+    pyyaml
+    cffi
+    matplotlib
+    numpy
+    ply
+    scipy
+    libngspice
+  ];
+
+  doCheck = false;
+  pythonImportsCheck = [ "PySpice" ];
+
+  postPatch = ''
+    substituteInPlace PySpice/Spice/NgSpice/Shared.py --replace \
+        "ffi.dlopen(self.library_path)" \
+        "ffi.dlopen('${libngspice}/lib/libngspice${stdenv.hostPlatform.extensions.sharedLibrary}')"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Simulate electronic circuit using Python and the Ngspice / Xyce simulators";
+    homepage = "https://github.com/FabriceSalvaire/PySpice";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ matthuszagh ];
+  };
+}
diff --git a/pkgs/development/python-modules/scikit-optimize/default.nix b/pkgs/development/python-modules/scikit-optimize/default.nix
index f8e30397189..0a5171f22fb 100644
--- a/pkgs/development/python-modules/scikit-optimize/default.nix
+++ b/pkgs/development/python-modules/scikit-optimize/default.nix
@@ -1,25 +1,29 @@
 { lib
+, isPy27
 , buildPythonPackage
 , fetchFromGitHub
+, matplotlib
 , numpy
 , scipy
 , scikitlearn
 , pyaml
-, pytest
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
   pname = "scikit-optimize";
-  version = "0.6";
+  version = "0.8.1";
+  disabled = isPy27;
 
   src = fetchFromGitHub {
     owner = "scikit-optimize";
     repo = "scikit-optimize";
     rev = "v${version}";
-    sha256 = "1srbb20k8ddhpcfxwdflapfh6xfyrd3dnclcg3bsfq1byrcmv0d4";
+    sha256 = "1bz8gxccx8n99abw49j8h5zf3i568g5hcf8nz1yinma8jqhxjkjh";
   };
 
   propagatedBuildInputs = [
+    matplotlib
     numpy
     scipy
     scikitlearn
@@ -27,14 +31,9 @@ buildPythonPackage rec {
   ];
 
   checkInputs = [
-    pytest
+    pytestCheckHook
   ];
 
-  # remove --ignore at next release > 0.6
-  checkPhase = ''
-    pytest skopt --ignore skopt/tests/test_searchcv.py
-  '';
-
   meta = with lib; {
     description = "Sequential model-based optimization toolbox";
     homepage = "https://scikit-optimize.github.io/";
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c2c471d9772..03b751ae288 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5383,6 +5383,8 @@ in {
 
   pyspf = callPackage ../development/python-modules/pyspf { };
 
+  pyspice = callPackage ../development/python-modules/pyspice { };
+
   pyspinel = callPackage ../development/python-modules/pyspinel { };
 
   pyspotify = callPackage ../development/python-modules/pyspotify { };