diff --git a/krebs/5pkgs/simple/buildbot-classic/default.nix b/krebs/5pkgs/simple/buildbot-classic/default.nix
index c127d2987..49d6ff322 100644
--- a/krebs/5pkgs/simple/buildbot-classic/default.nix
+++ b/krebs/5pkgs/simple/buildbot-classic/default.nix
@@ -1,6 +1,6 @@
-{ pkgs, fetchFromGitHub, python2Packages, git, ... }:
+{ pkgs, fetchFromGitHub, python3Packages, git, ... }:
 
-python2Packages.buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   name = "buildbot-classic-${version}";
   version = "0.8.18";
   namePrefix = "";
@@ -15,11 +15,10 @@ python2Packages.buildPythonApplication rec {
   postUnpack = "sourceRoot=\${sourceRoot}/master";
 
   propagatedBuildInputs = [
-    python2Packages.jinja2
-    python2Packages.twisted
-    python2Packages.dateutil
-    python2Packages.sqlalchemy_migrate
-    python2Packages.pysqlite
+    python3Packages.jinja2
+    python3Packages.twisted
+    python3Packages.dateutil
+    python3Packages.sqlalchemy_migrate
     pkgs.coreutils
   ];
   doCheck = false;
diff --git a/lass/5pkgs/xonsh2/default.nix b/lass/5pkgs/xonsh2/default.nix
new file mode 100644
index 000000000..d55d22445
--- /dev/null
+++ b/lass/5pkgs/xonsh2/default.nix
@@ -0,0 +1,56 @@
+{ lib, stdenv
+, fetchFromGitHub
+, python39Packages
+, glibcLocales
+, coreutils
+, git
+, extraInputs ? []
+}: let
+
+  python3Packages = python39Packages;
+
+in python3Packages.buildPythonApplication rec {
+  pname = "xonsh2";
+  version = "master";
+
+  # fetch from github because the pypi package ships incomplete tests
+  src = fetchFromGitHub {
+    owner = "anki-code";
+    repo = "xonsh2";
+    rev = "bd96fcdce9319ab6b90c7d9ac47d2249b61144d0";
+    sha256 = "0b632rac8macfp2mmvhh1f34cf1m5qfpjajwnf676qk7jzn79vx6";
+  };
+
+  LC_ALL = "en_US.UTF-8";
+
+  postPatch = ''
+    sed -ie 's|/usr/bin/env|${coreutils}/bin/env|' scripts/xon.sh
+    find scripts -name 'xonsh*' -exec sed -i -e "s|env -S|env|" {} \;
+    find -name "*.xsh" | xargs sed -ie 's|/usr/bin/env|${coreutils}/bin/env|'
+    patchShebangs .
+  '';
+
+  doCheck = false;
+
+  checkPhase = ''
+    HOME=$TMPDIR pytest -k 'not test_repath_backslash and not test_os and not test_man_completion and not test_builtins and not test_main and not test_ptk_highlight and not test_pyghooks'
+    HOME=$TMPDIR pytest -k 'test_builtins or test_main' --reruns 5
+    HOME=$TMPDIR pytest -k 'test_ptk_highlight'
+  '';
+
+  checkInputs = [ python3Packages.pytest python3Packages.pytest-rerunfailures glibcLocales git ];
+
+  propagatedBuildInputs = with python3Packages; [ ply prompt_toolkit pygments ] ++ extraInputs;
+
+  meta = with lib; {
+    description = "A Python-ish, BASHwards-compatible shell";
+    homepage = "https://xon.sh/";
+    # changelog = "https://github.com/xonsh/xonsh/releases/tag/${version}";
+    license = licenses.bsd3;
+    platforms = platforms.all;
+  };
+
+  passthru = {
+    shellPath = "/bin/xonsh2";
+  };
+}