diff --git a/nixos/doc/manual/release-notes/rl-1909.xml b/nixos/doc/manual/release-notes/rl-1909.xml
index f54592b6bf6c..f378c312b79f 100644
--- a/nixos/doc/manual/release-notes/rl-1909.xml
+++ b/nixos/doc/manual/release-notes/rl-1909.xml
@@ -42,6 +42,29 @@
   </itemizedlist>
  </section>
 
+ <section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="sec-release-19.09-incompatibilities">
+  <title>Backward Incompatibilities</title>
+
+  <para>
+   When upgrading from a previous release, please be aware of the following
+   incompatible changes:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     Buildbot no longer supports Python 2, as support was dropped upstream in
+     version 2.0.0. Configurations may need to be modified to make them
+     compatible with Python 3.
+    </para>
+   </listitem>
+  </itemizedlist>
+ </section>
+
  <section xmlns="http://docbook.org/ns/docbook"
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
diff --git a/nixos/modules/services/continuous-integration/buildbot/master.nix b/nixos/modules/services/continuous-integration/buildbot/master.nix
index 0f07e6133bb5..9c615fbe885f 100644
--- a/nixos/modules/services/continuous-integration/buildbot/master.nix
+++ b/nixos/modules/services/continuous-integration/buildbot/master.nix
@@ -199,10 +199,10 @@ in {
 
       package = mkOption {
         type = types.package;
-        default = pkgs.pythonPackages.buildbot-full;
-        defaultText = "pkgs.pythonPackages.buildbot-full";
+        default = pkgs.python3Packages.buildbot-full;
+        defaultText = "pkgs.python3Packages.buildbot-full";
         description = "Package to use for buildbot.";
-        example = literalExample "pkgs.python3Packages.buildbot-full";
+        example = literalExample "pkgs.python3Packages.buildbot";
       };
 
       packages = mkOption {
diff --git a/nixos/modules/services/continuous-integration/buildbot/worker.nix b/nixos/modules/services/continuous-integration/buildbot/worker.nix
index 4130ec918a70..49e04ca36228 100644
--- a/nixos/modules/services/continuous-integration/buildbot/worker.nix
+++ b/nixos/modules/services/continuous-integration/buildbot/worker.nix
@@ -118,10 +118,10 @@ in {
 
       package = mkOption {
         type = types.package;
-        default = pkgs.pythonPackages.buildbot-worker;
-        defaultText = "pkgs.pythonPackages.buildbot-worker";
+        default = pkgs.python3Packages.buildbot-worker;
+        defaultText = "pkgs.python3Packages.buildbot-worker";
         description = "Package to use for buildbot worker.";
-        example = literalExample "pkgs.python3Packages.buildbot-worker";
+        example = literalExample "pkgs.python2Packages.buildbot-worker";
       };
 
       packages = mkOption {
diff --git a/nixos/tests/buildbot.nix b/nixos/tests/buildbot.nix
index 210ad8e91df7..f5c8c4863b6f 100644
--- a/nixos/tests/buildbot.nix
+++ b/nixos/tests/buildbot.nix
@@ -5,116 +5,109 @@
 
 with import ../lib/testing.nix { inherit system pkgs; };
 
-let
-  # Test ensures buildbot master comes up correctly and workers can connect
-  mkBuildbotTest = python: makeTest {
-    name = "buildbot";
+# Test ensures buildbot master comes up correctly and workers can connect
+makeTest {
+  name = "buildbot";
 
-    nodes = {
-      bbmaster = { pkgs, ... }: {
-        services.buildbot-master = {
-          enable = true;
-          package = python.pkgs.buildbot-full;
+  nodes = {
+    bbmaster = { pkgs, ... }: {
+      services.buildbot-master = {
+        enable = true;
 
-          # NOTE: use fake repo due to no internet in hydra ci
-          factorySteps = [
-            "steps.Git(repourl='git://gitrepo/fakerepo.git', mode='incremental')"
-            "steps.ShellCommand(command=['bash', 'fakerepo.sh'])"
-          ];
-          changeSource = [
-            "changes.GitPoller('git://gitrepo/fakerepo.git', workdir='gitpoller-workdir', branch='master', pollinterval=300)"
-          ];
-        };
-        networking.firewall.allowedTCPPorts = [ 8010 8011 9989 ];
-        environment.systemPackages = with pkgs; [ git python.pkgs.buildbot-full ];
-      };
-
-      bbworker = { pkgs, ... }: {
-        services.buildbot-worker = {
-          enable = true;
-          masterUrl = "bbmaster:9989";
-        };
-        environment.systemPackages = with pkgs; [ git python.pkgs.buildbot-worker ];
-      };
-
-      gitrepo = { pkgs, ... }: {
-        services.openssh.enable = true;
-        networking.firewall.allowedTCPPorts = [ 22 9418 ];
-        environment.systemPackages = with pkgs; [ git ];
+        # NOTE: use fake repo due to no internet in hydra ci
+        factorySteps = [
+          "steps.Git(repourl='git://gitrepo/fakerepo.git', mode='incremental')"
+          "steps.ShellCommand(command=['bash', 'fakerepo.sh'])"
+        ];
+        changeSource = [
+          "changes.GitPoller('git://gitrepo/fakerepo.git', workdir='gitpoller-workdir', branch='master', pollinterval=300)"
+        ];
       };
+      networking.firewall.allowedTCPPorts = [ 8010 8011 9989 ];
+      environment.systemPackages = with pkgs; [ git python3Packages.buildbot-full ];
     };
 
-    testScript = ''
-      #Start up and populate fake repo
-      $gitrepo->waitForUnit("multi-user.target");
-      print($gitrepo->execute(" \
-        git config --global user.name 'Nobody Fakeuser' && \
-        git config --global user.email 'nobody\@fakerepo.com' && \
-        rm -rvf /srv/repos/fakerepo.git /tmp/fakerepo && \
-        mkdir -pv /srv/repos/fakerepo ~/.ssh && \
-        ssh-keyscan -H gitrepo > ~/.ssh/known_hosts && \
-        cat ~/.ssh/known_hosts && \
-        cd /srv/repos/fakerepo && \
-        git init && \
-        echo -e '#!/bin/sh\necho fakerepo' > fakerepo.sh && \
-        cat fakerepo.sh && \
-        touch .git/git-daemon-export-ok && \
-        git add fakerepo.sh .git/git-daemon-export-ok && \
-        git commit -m fakerepo && \
-        git daemon --verbose --export-all --base-path=/srv/repos --reuseaddr & \
-      "));
-
-      # Test gitrepo
-      $bbmaster->waitForUnit("network-online.target");
-      #$bbmaster->execute("nc -z gitrepo 9418");
-      print($bbmaster->execute(" \
-        rm -rfv /tmp/fakerepo && \
-        git clone git://gitrepo/fakerepo /tmp/fakerepo && \
-        pwd && \
-        ls -la && \
-        ls -la /tmp/fakerepo \
-      "));
-
-      # Test start master and connect worker
-      $bbmaster->waitForUnit("buildbot-master.service");
-      $bbmaster->waitUntilSucceeds("curl -s --head http://bbmaster:8010") =~ /200 OK/;
-      $bbworker->waitForUnit("network-online.target");
-      $bbworker->execute("nc -z bbmaster 8010");
-      $bbworker->execute("nc -z bbmaster 9989");
-      $bbworker->waitForUnit("buildbot-worker.service");
-      print($bbworker->execute("ls -la /home/bbworker/worker"));
-
-
-      # Test stop buildbot master and worker
-      print($bbmaster->execute(" \
-        systemctl -l --no-pager status buildbot-master && \
-        systemctl stop buildbot-master \
-      "));
-      $bbworker->fail("nc -z bbmaster 8010");
-      $bbworker->fail("nc -z bbmaster 9989");
-      print($bbworker->execute(" \
-        systemctl -l --no-pager status buildbot-worker && \
-        systemctl stop buildbot-worker && \
-        ls -la /home/bbworker/worker \
-      "));
-
-
-      # Test buildbot daemon mode
-      $bbmaster->execute("buildbot create-master /tmp");
-      $bbmaster->execute("mv -fv /tmp/master.cfg.sample /tmp/master.cfg");
-      $bbmaster->execute("sed -i 's/8010/8011/' /tmp/master.cfg");
-      $bbmaster->execute("buildbot start /tmp");
-      $bbworker->execute("nc -z bbmaster 8011");
-      $bbworker->waitUntilSucceeds("curl -s --head http://bbmaster:8011") =~ /200 OK/;
-      $bbmaster->execute("buildbot stop /tmp");
-      $bbworker->fail("nc -z bbmaster 8011");
-
-    '';
-
-    meta.maintainers = with pkgs.stdenv.lib.maintainers; [ nand0p ];
+    bbworker = { pkgs, ... }: {
+      services.buildbot-worker = {
+        enable = true;
+        masterUrl = "bbmaster:9989";
+      };
+      environment.systemPackages = with pkgs; [ git python3Packages.buildbot-worker ];
+    };
 
+    gitrepo = { pkgs, ... }: {
+      services.openssh.enable = true;
+      networking.firewall.allowedTCPPorts = [ 22 9418 ];
+      environment.systemPackages = with pkgs; [ git ];
+    };
   };
-in {
-  python2 = mkBuildbotTest pkgs.python2;
-  python3 = mkBuildbotTest pkgs.python3;
+
+  testScript = ''
+    #Start up and populate fake repo
+    $gitrepo->waitForUnit("multi-user.target");
+    print($gitrepo->execute(" \
+      git config --global user.name 'Nobody Fakeuser' && \
+      git config --global user.email 'nobody\@fakerepo.com' && \
+      rm -rvf /srv/repos/fakerepo.git /tmp/fakerepo && \
+      mkdir -pv /srv/repos/fakerepo ~/.ssh && \
+      ssh-keyscan -H gitrepo > ~/.ssh/known_hosts && \
+      cat ~/.ssh/known_hosts && \
+      cd /srv/repos/fakerepo && \
+      git init && \
+      echo -e '#!/bin/sh\necho fakerepo' > fakerepo.sh && \
+      cat fakerepo.sh && \
+      touch .git/git-daemon-export-ok && \
+      git add fakerepo.sh .git/git-daemon-export-ok && \
+      git commit -m fakerepo && \
+      git daemon --verbose --export-all --base-path=/srv/repos --reuseaddr & \
+    "));
+
+    # Test gitrepo
+    $bbmaster->waitForUnit("network-online.target");
+    #$bbmaster->execute("nc -z gitrepo 9418");
+    print($bbmaster->execute(" \
+      rm -rfv /tmp/fakerepo && \
+      git clone git://gitrepo/fakerepo /tmp/fakerepo && \
+      pwd && \
+      ls -la && \
+      ls -la /tmp/fakerepo \
+    "));
+
+    # Test start master and connect worker
+    $bbmaster->waitForUnit("buildbot-master.service");
+    $bbmaster->waitUntilSucceeds("curl -s --head http://bbmaster:8010") =~ /200 OK/;
+    $bbworker->waitForUnit("network-online.target");
+    $bbworker->execute("nc -z bbmaster 8010");
+    $bbworker->execute("nc -z bbmaster 9989");
+    $bbworker->waitForUnit("buildbot-worker.service");
+    print($bbworker->execute("ls -la /home/bbworker/worker"));
+
+
+    # Test stop buildbot master and worker
+    print($bbmaster->execute(" \
+      systemctl -l --no-pager status buildbot-master && \
+      systemctl stop buildbot-master \
+    "));
+    $bbworker->fail("nc -z bbmaster 8010");
+    $bbworker->fail("nc -z bbmaster 9989");
+    print($bbworker->execute(" \
+      systemctl -l --no-pager status buildbot-worker && \
+      systemctl stop buildbot-worker && \
+      ls -la /home/bbworker/worker \
+    "));
+
+
+    # Test buildbot daemon mode
+    $bbmaster->execute("buildbot create-master /tmp");
+    $bbmaster->execute("mv -fv /tmp/master.cfg.sample /tmp/master.cfg");
+    $bbmaster->execute("sed -i 's/8010/8011/' /tmp/master.cfg");
+    $bbmaster->execute("buildbot start /tmp");
+    $bbworker->execute("nc -z bbmaster 8011");
+    $bbworker->waitUntilSucceeds("curl -s --head http://bbmaster:8011") =~ /200 OK/;
+    $bbmaster->execute("buildbot stop /tmp");
+    $bbworker->fail("nc -z bbmaster 8011");
+
+  '';
+
+  meta.maintainers = with pkgs.stdenv.lib.maintainers; [ nand0p ];
 }
diff --git a/pkgs/development/python-modules/buildbot/default.nix b/pkgs/development/python-modules/buildbot/default.nix
index cd98a8da710a..268c08ced848 100644
--- a/pkgs/development/python-modules/buildbot/default.nix
+++ b/pkgs/development/python-modules/buildbot/default.nix
@@ -1,8 +1,9 @@
-{ stdenv, lib, buildPythonPackage, fetchPypi, makeWrapper, isPy3k,
+{ stdenv, lib, buildPythonPackage, /*fetchPypi,*/ fetchFromGitHub, makeWrapper, isPy3k,
   python, twisted, jinja2, zope_interface, future, sqlalchemy,
   sqlalchemy_migrate, dateutil, txaio, autobahn, pyjwt, pyyaml, treq,
   txrequests, txgithub, pyjade, boto3, moto, mock, python-lz4, setuptoolsTrial,
-  isort, pylint, flake8, buildbot-worker, buildbot-pkg, glibcLocales }:
+  isort, pylint, flake8, buildbot-worker, buildbot-pkg, parameterized,
+  glibcLocales }:
 
 let
   withPlugins = plugins: buildPythonPackage {
@@ -24,12 +25,21 @@ let
 
   package = buildPythonPackage rec {
     pname = "buildbot";
-    version = "1.8.1";
+    version = "2.1.0";
 
-    src = fetchPypi {
+    /*src = fetchPypi {
       inherit pname version;
-      sha256 = "1zadmyrlk7p9h1akmbzwa7p90s7jwsxvdx4xn9i54dnda450m3a7";
-    };
+      sha256 = "1745hj9s0c0fcdjv6w05bma76xqg1fv42v0dslmi4d8yz9phf37w";
+    };*/
+    # Temporarily use GitHub source because PyPi archive is missing some files
+    # needed for the tests to pass. This has been fixed upstream.
+    # See: https://github.com/buildbot/buildbot/commit/30f5927cf9a80f98ed909241a149469dec3ce68d
+    src = fetchFromGitHub {
+      owner = "buildbot";
+      repo = "buildbot";
+      rev = "v${version}";
+      sha256 = "022ybhdvp0hp2z0cwgx7n41jyh56bpxj3fwm4z7ppzj1qhm7lb65";
+    } + "/master";
 
     propagatedBuildInputs = [
       # core
@@ -63,6 +73,7 @@ let
       flake8
       buildbot-worker
       buildbot-pkg
+      parameterized
       glibcLocales
     ];
 
@@ -84,6 +95,8 @@ let
       export PATH="$out/bin:$PATH"
     '';
 
+    disabled = !isPy3k;
+
     passthru = {
       inherit withPlugins;
     };
diff --git a/pkgs/development/python-modules/buildbot/pkg.nix b/pkgs/development/python-modules/buildbot/pkg.nix
index 480bed2805ee..35524040da99 100644
--- a/pkgs/development/python-modules/buildbot/pkg.nix
+++ b/pkgs/development/python-modules/buildbot/pkg.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "buildbot-pkg";
-  version = "1.8.1";
+  version = "2.1.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "16gjdzkris6475bvsgvb0v6rkn4xb6f55s468q37n0l1r6n8snc3";
+    sha256 = "03lv97q4pp2izjfbwfv4zmf2fyiz7jyp537bi3gc6rhfbrfgib1i";
   };
 
   postPatch = ''
diff --git a/pkgs/development/python-modules/buildbot/plugins.nix b/pkgs/development/python-modules/buildbot/plugins.nix
index 4bcaa965d2f3..2f73fbc81a4f 100644
--- a/pkgs/development/python-modules/buildbot/plugins.nix
+++ b/pkgs/development/python-modules/buildbot/plugins.nix
@@ -10,7 +10,8 @@
 
     src = fetchPypi {
       inherit pname version format;
-      sha256 = "03cgjhwpgbm0qgis1cdy9g4vc11hsrya9grcx4j35784rny7lbfl";
+      python = "py3";
+      sha256 = "011sagw8zp1z12vzkxi44w3w2lbxncz5yahkrbxj8hp6iwfzfm5v";
     };
 
     meta = with lib; {
@@ -27,7 +28,7 @@
 
     src = fetchPypi {
       inherit pname version;
-      sha256 = "0pfp2n4ys99jglshdrp2f6jm73c4ym3dfwl6qjvbc7y7nsi74824";
+      sha256 = "11gz4ry1law3l64ii383cj5fnbw9409czp2ybzkqafr4xi1qbk9h";
     };
 
     propagatedBuildInputs = [ buildbot-pkg ];
@@ -47,7 +48,7 @@
 
     src = fetchPypi {
       inherit pname version;
-      sha256 = "0gnxq9niw64q36dm917lhhcl8zp0wjwaamjp07zidnrb5c3pjbsz";
+      sha256 = "0w4iwpj1rg20fbli0ppqz70l1mc9ilg0crq8g3xrf29f9z8d1w27";
     };
 
     propagatedBuildInputs = [ buildbot-pkg ];
@@ -67,7 +68,7 @@
 
     src = fetchPypi {
       inherit pname version;
-      sha256 = "1b06aa8m1pzqq2d8imrq5mazc7llrlbgm7jzi8h6jjd2gahdjgz5";
+      sha256 = "0xyvxamw45qhnfml3x5hfg9nai1jhdwbmq4pm8csf3ad0cw6vqya";
     };
 
     propagatedBuildInputs = [ buildbot-pkg ];
@@ -87,7 +88,7 @@
 
     src = fetchPypi {
       inherit pname version;
-      sha256 = "1v8411bw0cs206vwfnqx1na7dzg77h9aff4wlm11hkbdsy9ayv2d";
+      sha256 = "1szcrx8vslskifzxaq7lrfg2arilaq1w1aqr0nc8pjclj7idp92c";
     };
 
     propagatedBuildInputs = [ buildbot-pkg ];
diff --git a/pkgs/development/python-modules/buildbot/worker.nix b/pkgs/development/python-modules/buildbot/worker.nix
index 8e49d085fbd1..f888448db218 100644
--- a/pkgs/development/python-modules/buildbot/worker.nix
+++ b/pkgs/development/python-modules/buildbot/worker.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage (rec {
   pname = "buildbot-worker";
-  version = "1.8.1";
+  version = "2.1.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1rh73jbyms4b9wgkkdzcn80xfd18p8rn89rw4rsi2002ydrc7n39";
+    sha256 = "14qimaf513h2hklcpix8vscrawvr1qiyn1vy88ycpsbz9mcqbhps";
   };
 
   propagatedBuildInputs = [ twisted future ];
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 96396acb9e62..864cc7d678c4 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -49,11 +49,11 @@ mapAliases ({
   bashCompletion = bash-completion; # Added 2016-09-28
   bridge_utils = bridge-utils;  # added 2015-02-20
   btrfsProgs = btrfs-progs; # added 2016-01-03
-  buildbot = pythonPackages.buildbot; # added 2018-10-11
-  buildbot-full = pythonPackages.buildbot-full; # added 2018-10-11
-  buildbot-pkg = pythonPackages.buildbot-pkg; # added 2018-10-11
-  buildbot-ui = pythonPackages.buildbot-ui; # added 2018-10-11
-  buildbot-worker = pythonPackages.buildbot-worker; # added 2018-10-11
+  buildbot = python3Packages.buildbot; # added 2018-10-11
+  buildbot-full = python3Packages.buildbot-full; # added 2018-10-11
+  buildbot-pkg = python3Packages.buildbot-pkg; # added 2018-10-11
+  buildbot-ui = python3Packages.buildbot-ui; # added 2018-10-11
+  buildbot-worker = python3Packages.buildbot-worker; # added 2018-10-11
   buildPerlPackage = perlPackages.buildPerlPackage; # added 2018-10-12
   bundler_HEAD = bundler; # added 2015-11-15
   cantarell_fonts = cantarell-fonts; # added 2018-03-03