diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
--- a/.travis.yml
+++ /dev/null
@@ -1,174 +0,0 @@
-# This Travis job script has been generated by a script via
-#
-#   haskell-ci '--output=.travis.yml' '--config=cabal.haskell-ci' 'cabal.project'
-#
-# To regenerate the script (for example after adjusting tested-with) run
-#
-#   haskell-ci regenerate
-#
-# For more information, see https://github.com/haskell-CI/haskell-ci
-#
-# version: 0.10
-#
-version: ~> 1.0
-language: c
-os: linux
-dist: xenial
-git:
-  # whether to recursively clone submodules
-  submodules: false
-notifications:
-  irc:
-    channels:
-      - irc.freenode.org#haskell-lens
-    skip_join: true
-    template:
-      - "\x0313machines\x03/\x0306%{branch}\x03 \x0314%{commit}\x03 %{build_url} %{message}"
-cache:
-  directories:
-    - $HOME/.cabal/packages
-    - $HOME/.cabal/store
-    - $HOME/.hlint
-before_cache:
-  - rm -fv $CABALHOME/packages/hackage.haskell.org/build-reports.log
-  # remove files that are regenerated by 'cabal update'
-  - rm -fv $CABALHOME/packages/hackage.haskell.org/00-index.*
-  - rm -fv $CABALHOME/packages/hackage.haskell.org/*.json
-  - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.cache
-  - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.tar
-  - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.tar.idx
-  - rm -rfv $CABALHOME/packages/head.hackage
-jobs:
-  include:
-    - compiler: ghc-8.10.1
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.10.1","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-8.8.3
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.8.3","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-8.6.5
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.6.5","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-8.4.4
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.4.4","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-8.2.2
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.2.2","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-8.0.2
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.0.2","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-7.10.3
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.10.3","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-7.8.4
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.8.4","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-7.6.3
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.6.3","cabal-install-3.2"]}}
-      os: linux
-    - compiler: ghc-7.4.2
-      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.4.2","cabal-install-3.2"]}}
-      os: linux
-before_install:
-  - HC=$(echo "/opt/$CC/bin/ghc" | sed 's/-/\//')
-  - WITHCOMPILER="-w $HC"
-  - HADDOCK=$(echo "/opt/$CC/bin/haddock" | sed 's/-/\//')
-  - HCPKG="$HC-pkg"
-  - unset CC
-  - CABAL=/opt/ghc/bin/cabal
-  - CABALHOME=$HOME/.cabal
-  - export PATH="$CABALHOME/bin:$PATH"
-  - TOP=$(pwd)
-  - "HCNUMVER=$(${HC} --numeric-version|perl -ne '/^(\\d+)\\.(\\d+)\\.(\\d+)(\\.(\\d+))?$/; print(10000 * $1 + 100 * $2 + ($3 == 0 ? $5 != 1 : $3))')"
-  - echo $HCNUMVER
-  - CABAL="$CABAL -vnormal+nowrap"
-  - set -o pipefail
-  - TEST=--enable-tests
-  - BENCH=--enable-benchmarks
-  - if [ $HCNUMVER -lt 80000 ] ; then BENCH=--disable-benchmarks ; fi
-  - HEADHACKAGE=false
-  - rm -f $CABALHOME/config
-  - |
-    echo "verbose: normal +nowrap +markoutput"          >> $CABALHOME/config
-    echo "remote-build-reporting: anonymous"            >> $CABALHOME/config
-    echo "write-ghc-environment-files: always"          >> $CABALHOME/config
-    echo "remote-repo-cache: $CABALHOME/packages"       >> $CABALHOME/config
-    echo "logs-dir:          $CABALHOME/logs"           >> $CABALHOME/config
-    echo "world-file:        $CABALHOME/world"          >> $CABALHOME/config
-    echo "extra-prog-path:   $CABALHOME/bin"            >> $CABALHOME/config
-    echo "symlink-bindir:    $CABALHOME/bin"            >> $CABALHOME/config
-    echo "installdir:        $CABALHOME/bin"            >> $CABALHOME/config
-    echo "build-summary:     $CABALHOME/logs/build.log" >> $CABALHOME/config
-    echo "store-dir:         $CABALHOME/store"          >> $CABALHOME/config
-    echo "install-dirs user"                            >> $CABALHOME/config
-    echo "  prefix: $CABALHOME"                         >> $CABALHOME/config
-    echo "repository hackage.haskell.org"               >> $CABALHOME/config
-    echo "  url: http://hackage.haskell.org/"           >> $CABALHOME/config
-install:
-  - ${CABAL} --version
-  - echo "$(${HC} --version) [$(${HC} --print-project-git-commit-id 2> /dev/null || echo '?')]"
-  - |
-    echo "program-default-options"                >> $CABALHOME/config
-    echo "  ghc-options: $GHCJOBS +RTS -M6G -RTS" >> $CABALHOME/config
-  - cat $CABALHOME/config
-  - rm -fv cabal.project cabal.project.local cabal.project.freeze
-  - travis_retry ${CABAL} v2-update -v
-  # Generate cabal.project
-  - rm -rf cabal.project cabal.project.local cabal.project.freeze
-  - touch cabal.project
-  - |
-    echo "packages: ." >> cabal.project
-    echo "packages: ./examples" >> cabal.project
-  - if [ $HCNUMVER -ge 80200 ] ; then echo 'package machines' >> cabal.project ; fi
-  - "if [ $HCNUMVER -ge 80200 ] ; then echo '  ghc-options: -Werror=missing-methods' >> cabal.project ; fi"
-  - if [ $HCNUMVER -ge 80200 ] ; then echo 'package machines-examples' >> cabal.project ; fi
-  - "if [ $HCNUMVER -ge 80200 ] ; then echo '  ghc-options: -Werror=missing-methods' >> cabal.project ; fi"
-  - |
-  - "for pkg in $($HCPKG list --simple-output); do echo $pkg | sed 's/-[^-]*$//' | (grep -vE -- '^(machines|machines-examples)$' || true) | sed 's/^/constraints: /' | sed 's/$/ installed/' >> cabal.project.local; done"
-  - cat cabal.project || true
-  - cat cabal.project.local || true
-  - if [ -f "./configure.ac" ]; then (cd "." && autoreconf -i); fi
-  - if [ -f "./examples/configure.ac" ]; then (cd "./examples" && autoreconf -i); fi
-  - ${CABAL} v2-freeze $WITHCOMPILER ${TEST} ${BENCH}
-  - "cat cabal.project.freeze | sed -E 's/^(constraints: *| *)//' | sed 's/any.//'"
-  - rm  cabal.project.freeze
-  - travis_wait 40 ${CABAL} v2-build $WITHCOMPILER ${TEST} ${BENCH} --dep -j2 all
-script:
-  - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)
-  # Packaging...
-  - ${CABAL} v2-sdist all
-  # Unpacking...
-  - mv dist-newstyle/sdist/*.tar.gz ${DISTDIR}/
-  - cd ${DISTDIR} || false
-  - find . -maxdepth 1 -type f -name '*.tar.gz' -exec tar -xvf '{}' \;
-  - find . -maxdepth 1 -type f -name '*.tar.gz' -exec rm       '{}' \;
-  - PKGDIR_machines="$(find . -maxdepth 1 -type d -regex '.*/machines-[0-9.]*')"
-  - PKGDIR_machines_examples="$(find . -maxdepth 1 -type d -regex '.*/machines-examples-[0-9.]*')"
-  # Generate cabal.project
-  - rm -rf cabal.project cabal.project.local cabal.project.freeze
-  - touch cabal.project
-  - |
-    echo "packages: ${PKGDIR_machines}" >> cabal.project
-    echo "packages: ${PKGDIR_machines_examples}" >> cabal.project
-  - if [ $HCNUMVER -ge 80200 ] ; then echo 'package machines' >> cabal.project ; fi
-  - "if [ $HCNUMVER -ge 80200 ] ; then echo '  ghc-options: -Werror=missing-methods' >> cabal.project ; fi"
-  - if [ $HCNUMVER -ge 80200 ] ; then echo 'package machines-examples' >> cabal.project ; fi
-  - "if [ $HCNUMVER -ge 80200 ] ; then echo '  ghc-options: -Werror=missing-methods' >> cabal.project ; fi"
-  - |
-  - "for pkg in $($HCPKG list --simple-output); do echo $pkg | sed 's/-[^-]*$//' | (grep -vE -- '^(machines|machines-examples)$' || true) | sed 's/^/constraints: /' | sed 's/$/ installed/' >> cabal.project.local; done"
-  - cat cabal.project || true
-  - cat cabal.project.local || true
-  # Building with tests and benchmarks...
-  # build & run tests, build benchmarks
-  - ${CABAL} v2-build $WITHCOMPILER ${TEST} ${BENCH} all
-  # Testing...
-  - ${CABAL} v2-test $WITHCOMPILER ${TEST} ${BENCH} all
-  # cabal check...
-  - (cd ${PKGDIR_machines} && ${CABAL} -vnormal check)
-  - (cd ${PKGDIR_machines_examples} && ${CABAL} -vnormal check)
-  # haddock...
-  - ${CABAL} v2-haddock $WITHCOMPILER --with-haddock $HADDOCK ${TEST} ${BENCH} all
-
-# REGENDATA ("0.10",["--output=.travis.yml","--config=cabal.haskell-ci","cabal.project"])
-# EOF
diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,10 @@
+0.7.2 [2021.02.17]
+------------------
+* The build-type has been changed from `Custom` to `Simple`.
+  To achieve this, the `doctests` test suite has been removed in favor of using
+  [`cabal-docspec`](https://github.com/phadej/cabal-extras/tree/master/cabal-docspec)
+  to run the doctests.
+
 0.7.1 [2020.10.02]
 ------------------
 * Allow building with GHC 9.0.
diff --git a/README.markdown b/README.markdown
--- a/README.markdown
+++ b/README.markdown
@@ -1,7 +1,7 @@
 machines
 ========
 
-[![Hackage](https://img.shields.io/hackage/v/machines.svg)](https://hackage.haskell.org/package/machines) [![Build Status](https://secure.travis-ci.org/ekmett/machines.png?branch=master)](http://travis-ci.org/ekmett/machines)
+[![Hackage](https://img.shields.io/hackage/v/machines.svg)](https://hackage.haskell.org/package/machines) [![Build Status](https://github.com/ekmett/machines/workflows/Haskell-CI/badge.svg)](https://github.com/ekmett/machines/actions?query=workflow%3AHaskell-CI)
 
 *Ceci n'est pas une pipe*
 
diff --git a/Setup.lhs b/Setup.lhs
--- a/Setup.lhs
+++ b/Setup.lhs
@@ -1,34 +1,7 @@
-\begin{code}
-{-# LANGUAGE CPP #-}
-{-# OPTIONS_GHC -Wall #-}
-module Main (main) where
-
-#ifndef MIN_VERSION_cabal_doctest
-#define MIN_VERSION_cabal_doctest(x,y,z) 0
-#endif
-
-#if MIN_VERSION_cabal_doctest(1,0,0)
-
-import Distribution.Extra.Doctest ( defaultMainWithDoctests )
-main :: IO ()
-main = defaultMainWithDoctests "doctests"
-
-#else
-
-#ifdef MIN_VERSION_Cabal
--- If the macro is defined, we have new cabal-install,
--- but for some reason we don't have cabal-doctest in package-db
---
--- Probably we are running cabal sdist, when otherwise using new-build
--- workflow
-import Warning ()
-#endif
-
-import Distribution.Simple
-
-main :: IO ()
-main = defaultMain
+#!/usr/bin/runhaskell
+> module Main (main) where
 
-#endif
+> import Distribution.Simple
 
-\end{code}
+> main :: IO ()
+> main = defaultMain
diff --git a/Warning.hs b/Warning.hs
deleted file mode 100644
--- a/Warning.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-module Warning
-  {-# WARNING ["You are configuring this package without cabal-doctest installed.",
-               "The doctests test-suite will not work as a result.",
-               "To fix this, install cabal-doctest before configuring."] #-}
-  () where
diff --git a/machines.cabal b/machines.cabal
--- a/machines.cabal
+++ b/machines.cabal
@@ -1,6 +1,6 @@
 name:          machines
 category:      Control, Enumerator
-version:       0.7.1
+version:       0.7.2
 license:       BSD3
 cabal-version: >= 1.10
 license-file:  LICENSE
@@ -16,7 +16,7 @@
   .
   Rúnar Bjarnason's talk on machines can be downloaded from:
   <http://web.archive.org/web/20161029161813/https://dl.dropboxusercontent.com/u/4588997/Machines.pdf>
-build-type:    Custom
+build-type:    Simple
 tested-with:   GHC == 7.4.2
              , GHC == 7.6.3
              , GHC == 7.8.4
@@ -28,13 +28,11 @@
              , GHC == 8.8.3
              , GHC == 8.10.1
 extra-source-files:
-  .travis.yml
   .gitignore
   .vim.custom
   config
   README.markdown
   CHANGELOG.markdown
-  Warning.hs
   examples/LICENSE
   examples/machines-examples.cabal
   examples/*.hs
@@ -43,12 +41,6 @@
   type: git
   location: git://github.com/ekmett/machines.git
 
-custom-setup
-  setup-depends:
-    base          >= 4 && < 5,
-    Cabal,
-    cabal-doctest >= 1 && < 1.1
-
 library
   build-depends:
     adjunctions  >= 4.2   && < 5,
@@ -105,18 +97,6 @@
     build-depends: fail == 4.9.*
 
   hs-source-dirs: src
-
--- Verify the results of the examples
-test-suite doctests
-  type:    exitcode-stdio-1.0
-  main-is: doctests.hs
-  default-language: Haskell2010
-  build-depends:
-    base    == 4.*,
-    doctest >= 0.11.1 && < 0.18,
-    machines
-  ghc-options: -Wall -threaded
-  hs-source-dirs: tests
 
 benchmark benchmarks
   default-language: Haskell2010
diff --git a/src/Data/Machine/Group.hs b/src/Data/Machine/Group.hs
--- a/src/Data/Machine/Group.hs
+++ b/src/Data/Machine/Group.hs
@@ -9,6 +9,9 @@
 import Data.Machine
 import qualified Data.Machine.Group.General as Group
 
+-- $setup
+-- >>> import Data.Machine
+
 -- | Using a function to signal group changes, apply a machine independently over each group.
 groupingOn :: Monad m => (a -> a -> Bool) -> ProcessT m a b -> ProcessT m a b
 groupingOn = Group.groupingOn_
diff --git a/src/Data/Machine/Group/General.hs b/src/Data/Machine/Group/General.hs
--- a/src/Data/Machine/Group/General.hs
+++ b/src/Data/Machine/Group/General.hs
@@ -28,14 +28,11 @@
 import           Control.Monad (guard)
 import           Data.Machine
 
-#if __GLASGOW_HASKELL__ < 710
 -- $setup
 -- >>> import Control.Monad.Trans.Reader (ask, runReader)
+-- >>> import Control.Monad (guard)
 -- >>> import Control.Applicative ((<$))
-#else
--- $setup
--- >>> import Control.Monad.Trans.Reader (ask, runReader)
-#endif
+-- >>> import Data.Machine
 
 -- A strict tuple type.
 data Strict2 a b = Strict2 !a !b
diff --git a/src/Data/Machine/Mealy.hs b/src/Data/Machine/Mealy.hs
--- a/src/Data/Machine/Mealy.hs
+++ b/src/Data/Machine/Mealy.hs
@@ -43,7 +43,7 @@
 import Prelude hiding ((.),id)
 
 -- $setup
--- >>> import Data.Machine.Source
+-- >>> import Data.Machine
 
 -- | 'Mealy' machines
 --
diff --git a/src/Data/Machine/Process.hs b/src/Data/Machine/Process.hs
--- a/src/Data/Machine/Process.hs
+++ b/src/Data/Machine/Process.hs
@@ -76,7 +76,8 @@
 #endif
 
 -- $setup
--- >>> import Data.Machine.Source
+-- >>> import Data.Machine
+-- >>> import Data.Monoid (Sum (..))
 
 infixr 9 <~
 infixl 9 ~>
diff --git a/src/Data/Machine/Source.hs b/src/Data/Machine/Source.hs
--- a/src/Data/Machine/Source.hs
+++ b/src/Data/Machine/Source.hs
@@ -34,6 +34,9 @@
 import Data.Machine.Process
 import Prelude (Enum, Int, Maybe, Monad, ($), (>>=), return)
 
+-- $setup
+-- >>> import Data.Machine
+
 -------------------------------------------------------------------------------
 -- Source
 -------------------------------------------------------------------------------
diff --git a/src/Data/Machine/Tee.hs b/src/Data/Machine/Tee.hs
--- a/src/Data/Machine/Tee.hs
+++ b/src/Data/Machine/Tee.hs
@@ -30,6 +30,9 @@
 import Data.Machine.Source
 import Prelude hiding ((.), id, zipWith)
 
+-- $setup
+-- >>> import Data.Machine
+
 -------------------------------------------------------------------------------
 -- Tees
 -------------------------------------------------------------------------------
diff --git a/tests/doctests.hs b/tests/doctests.hs
deleted file mode 100644
--- a/tests/doctests.hs
+++ /dev/null
@@ -1,25 +0,0 @@
------------------------------------------------------------------------------
--- |
--- Module      :  Main (doctests)
--- Copyright   :  (C) 2012-14 Edward Kmett
--- License     :  BSD-style (see the file LICENSE)
--- Maintainer  :  Edward Kmett <ekmett@gmail.com>
--- Stability   :  provisional
--- Portability :  portable
---
--- This module provides doctests for a project based on the actual versions
--- of the packages it was built with. It requires a corresponding Setup.lhs
--- to be added to the project
------------------------------------------------------------------------------
-module Main where
-
-import Build_doctests (flags, pkgs, module_sources)
-import Data.Foldable (traverse_)
-import Test.DocTest
-
-main :: IO ()
-main = do
-    traverse_ putStrLn args
-    doctest args
-  where
-    args = flags ++ pkgs ++ module_sources
