diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cefdbe1..e586513 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
           # dependencies, so it is probably okay we aren't testing on OSX.
           # - macOS-latest
         cabal:
-          - "latest"
+          - "3.12.1.0"
         ghc:
           - "8.0.2"
           - "8.2.2"
@@ -37,6 +37,10 @@ jobs:
           - "8.10.7"
           - "9.0.2"
           - "9.2.4"
+          - "9.4.8"
+          - "9.6.6"
+          - "9.8.4"
+          - "9.10.1"
 
     steps:
     - uses: actions/checkout@v2
@@ -73,9 +77,14 @@ jobs:
         rm ./cabal.project
         cabal build package:pretty-simple --enable-tests --enable-benchmarks --write-ghc-environment-files=always --flags="buildexample"
 
+    - name: Install doctest
+      run: |
+        cabal install --ignore-project doctest --flag cabal-doctest
+        echo "$HOME/.cabal/bin" >> $GITHUB_PATH
+
     - name: Test
       run: |
-        cabal test package:pretty-simple --enable-tests
+        cabal doctest
 
   stack:
     name: stack / ubuntu-latest
@@ -104,10 +113,6 @@ jobs:
       run: |
         stack build --test --bench --no-run-tests --no-run-benchmarks --flag pretty-simple:buildexample
 
-    - name: Test
-      run: |
-        stack test
-
   nix-build-web:
     name: Nix build GHCJS web
     runs-on: ubuntu-latest
diff --git a/README.md b/README.md
index edc6ab3..d454a16 100644
--- a/README.md
+++ b/README.md
@@ -215,6 +215,14 @@ Feel free to open an
 [PR](https://github.com/cdepillabout/pretty-simple/pulls) for any
 bugs/problems/suggestions/improvements.
 
+### Testing
+
+To run the test suite locally, one must install the executables `doctest` and
+`cabal-doctest`, e.g. with
+`cabal install --ignore-project doctest --flag cabal-doctest`.
+
+Then run the command `cabal doctest`.
+
 ## Maintainers
 
 - [@cdepillabout](https://github.com/cdepillabout)
diff --git a/Setup.hs b/Setup.hs
deleted file mode 100644
index 1715887..0000000
--- a/Setup.hs
+++ /dev/null
@@ -1,33 +0,0 @@
-{-# 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 "pretty-simple-doctest"
-
-#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
-#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.
-#endif
-
-import Distribution.Simple
-
-main :: IO ()
-main = defaultMain
-
-#endif
diff --git a/pretty-simple.cabal b/pretty-simple.cabal
index 925117e..d7cd32a 100644
--- a/pretty-simple.cabal
+++ b/pretty-simple.cabal
@@ -9,17 +9,12 @@ author:              Dennis Gosnell
 maintainer:          cdep.illabout@gmail.com
 copyright:           2017-2019 Dennis Gosnell
 category:            Text
-build-type:          Custom
+build-type:          Simple
 extra-source-files:  CHANGELOG.md
                    , README.md
                    , img/pretty-simple-example-screenshot.png
 cabal-version:       >=1.10
 
-custom-setup
-  setup-depends:     base
-                   , Cabal >= 1.24
-                   , cabal-doctest >=1.0.2
-
 flag buildexe
   description: Build an small command line program that pretty-print anything from stdin.
   default:     True
@@ -96,18 +91,6 @@ executable pretty-simple-json-example
   else
     buildable:       False
 
-test-suite pretty-simple-doctest
-  type:                exitcode-stdio-1.0
-  main-is:             DocTest.hs
-  hs-source-dirs:      test
-  build-depends:       base
-                     , doctest >= 0.13
-                     , Glob
-                     , QuickCheck
-                     , template-haskell
-  default-language:    Haskell2010
-  ghc-options:         -Wall -threaded -rtsopts -with-rtsopts=-N
-
 benchmark pretty-simple-bench
   type:                exitcode-stdio-1.0
   main-is:             Bench.hs
diff --git a/test/DocTest.hs b/test/DocTest.hs
deleted file mode 100644
index 93f7655..0000000
--- a/test/DocTest.hs
+++ /dev/null
@@ -1,12 +0,0 @@
-module Main where
-
-import Build_doctests (flags, pkgs, module_sources)
--- import Data.Foldable (traverse_)
-import Test.DocTest (doctest)
-
-main :: IO ()
-main = do
-  -- traverse_ putStrLn args
-  doctest args
-  where
-    args = flags ++ pkgs ++ module_sources