diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
new file mode 100644
index 0000000..61c7a66
--- /dev/null
+++ b/.github/workflows/haskell-ci.yml
@@ -0,0 +1,267 @@
+# This GitHub workflow config has been generated by a script via
+#
+#   haskell-ci 'github' 'ini.cabal'
+#
+# 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: 0.14.3.20220416
+#
+# REGENDATA ("0.14.3.20220416",["github","ini.cabal"])
+#
+name: Haskell-CI
+on:
+  - push
+  - pull_request
+jobs:
+  linux:
+    name: Haskell-CI - Linux - ${{ matrix.compiler }}
+    runs-on: ubuntu-18.04
+    timeout-minutes:
+      60
+    container:
+      image: buildpack-deps:bionic
+    continue-on-error: ${{ matrix.allow-failure }}
+    strategy:
+      matrix:
+        include:
+          - compiler: ghc-9.2.2
+            compilerKind: ghc
+            compilerVersion: 9.2.2
+            setup-method: ghcup
+            allow-failure: false
+          - compiler: ghc-9.0.2
+            compilerKind: ghc
+            compilerVersion: 9.0.2
+            setup-method: ghcup
+            allow-failure: false
+          - compiler: ghc-8.10.7
+            compilerKind: ghc
+            compilerVersion: 8.10.7
+            setup-method: ghcup
+            allow-failure: false
+          - compiler: ghc-8.8.4
+            compilerKind: ghc
+            compilerVersion: 8.8.4
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-8.6.5
+            compilerKind: ghc
+            compilerVersion: 8.6.5
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-8.4.4
+            compilerKind: ghc
+            compilerVersion: 8.4.4
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-8.2.2
+            compilerKind: ghc
+            compilerVersion: 8.2.2
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-8.0.2
+            compilerKind: ghc
+            compilerVersion: 8.0.2
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-7.10.3
+            compilerKind: ghc
+            compilerVersion: 7.10.3
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-7.8.4
+            compilerKind: ghc
+            compilerVersion: 7.8.4
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-7.6.3
+            compilerKind: ghc
+            compilerVersion: 7.6.3
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-7.4.2
+            compilerKind: ghc
+            compilerVersion: 7.4.2
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-7.2.2
+            compilerKind: ghc
+            compilerVersion: 7.2.2
+            setup-method: hvr-ppa
+            allow-failure: false
+          - compiler: ghc-7.0.4
+            compilerKind: ghc
+            compilerVersion: 7.0.4
+            setup-method: hvr-ppa
+            allow-failure: false
+      fail-fast: false
+    steps:
+      - name: apt
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends gnupg ca-certificates dirmngr curl git software-properties-common libtinfo5
+          if [ "${{ matrix.setup-method }}" = ghcup ]; then
+            mkdir -p "$HOME/.ghcup/bin"
+            curl -sL https://downloads.haskell.org/ghcup/0.1.17.5/x86_64-linux-ghcup-0.1.17.5 > "$HOME/.ghcup/bin/ghcup"
+            chmod a+x "$HOME/.ghcup/bin/ghcup"
+            "$HOME/.ghcup/bin/ghcup" install ghc "$HCVER"
+            "$HOME/.ghcup/bin/ghcup" install cabal 3.6.2.0
+          else
+            apt-add-repository -y 'ppa:hvr/ghc'
+            apt-get update
+            apt-get install -y "$HCNAME"
+            mkdir -p "$HOME/.ghcup/bin"
+            curl -sL https://downloads.haskell.org/ghcup/0.1.17.5/x86_64-linux-ghcup-0.1.17.5 > "$HOME/.ghcup/bin/ghcup"
+            chmod a+x "$HOME/.ghcup/bin/ghcup"
+            "$HOME/.ghcup/bin/ghcup" install cabal 3.6.2.0
+          fi
+        env:
+          HCKIND: ${{ matrix.compilerKind }}
+          HCNAME: ${{ matrix.compiler }}
+          HCVER: ${{ matrix.compilerVersion }}
+      - name: Set PATH and environment variables
+        run: |
+          echo "$HOME/.cabal/bin" >> $GITHUB_PATH
+          echo "LANG=C.UTF-8" >> "$GITHUB_ENV"
+          echo "CABAL_DIR=$HOME/.cabal" >> "$GITHUB_ENV"
+          echo "CABAL_CONFIG=$HOME/.cabal/config" >> "$GITHUB_ENV"
+          HCDIR=/opt/$HCKIND/$HCVER
+          if [ "${{ matrix.setup-method }}" = ghcup ]; then
+            HC=$HOME/.ghcup/bin/$HCKIND-$HCVER
+            echo "HC=$HC" >> "$GITHUB_ENV"
+            echo "HCPKG=$HOME/.ghcup/bin/$HCKIND-pkg-$HCVER" >> "$GITHUB_ENV"
+            echo "HADDOCK=$HOME/.ghcup/bin/haddock-$HCVER" >> "$GITHUB_ENV"
+            echo "CABAL=$HOME/.ghcup/bin/cabal-3.6.2.0 -vnormal+nowrap" >> "$GITHUB_ENV"
+          else
+            HC=$HCDIR/bin/$HCKIND
+            echo "HC=$HC" >> "$GITHUB_ENV"
+            echo "HCPKG=$HCDIR/bin/$HCKIND-pkg" >> "$GITHUB_ENV"
+            echo "HADDOCK=$HCDIR/bin/haddock" >> "$GITHUB_ENV"
+            echo "CABAL=$HOME/.ghcup/bin/cabal-3.6.2.0 -vnormal+nowrap" >> "$GITHUB_ENV"
+          fi
+
+          HCNUMVER=$(${HC} --numeric-version|perl -ne '/^(\d+)\.(\d+)\.(\d+)(\.(\d+))?$/; print(10000 * $1 + 100 * $2 + ($3 == 0 ? $5 != 1 : $3))')
+          echo "HCNUMVER=$HCNUMVER" >> "$GITHUB_ENV"
+          echo "ARG_TESTS=--enable-tests" >> "$GITHUB_ENV"
+          echo "ARG_BENCH=--enable-benchmarks" >> "$GITHUB_ENV"
+          echo "HEADHACKAGE=false" >> "$GITHUB_ENV"
+          echo "ARG_COMPILER=--$HCKIND --with-compiler=$HC" >> "$GITHUB_ENV"
+          echo "GHCJSARITH=0" >> "$GITHUB_ENV"
+        env:
+          HCKIND: ${{ matrix.compilerKind }}
+          HCNAME: ${{ matrix.compiler }}
+          HCVER: ${{ matrix.compilerVersion }}
+      - name: env
+        run: |
+          env
+      - name: write cabal config
+        run: |
+          mkdir -p $CABAL_DIR
+          cat >> $CABAL_CONFIG <<EOF
+          remote-build-reporting: anonymous
+          write-ghc-environment-files: never
+          remote-repo-cache: $CABAL_DIR/packages
+          logs-dir:          $CABAL_DIR/logs
+          world-file:        $CABAL_DIR/world
+          extra-prog-path:   $CABAL_DIR/bin
+          symlink-bindir:    $CABAL_DIR/bin
+          installdir:        $CABAL_DIR/bin
+          build-summary:     $CABAL_DIR/logs/build.log
+          store-dir:         $CABAL_DIR/store
+          install-dirs user
+            prefix: $CABAL_DIR
+          repository hackage.haskell.org
+            url: http://hackage.haskell.org/
+          EOF
+          cat >> $CABAL_CONFIG <<EOF
+          program-default-options
+            ghc-options: $GHCJOBS +RTS -M3G -RTS
+          EOF
+          cat $CABAL_CONFIG
+      - name: versions
+        run: |
+          $HC --version || true
+          $HC --print-project-git-commit-id || true
+          $CABAL --version || true
+      - name: update cabal index
+        run: |
+          $CABAL v2-update -v
+      - name: install cabal-plan
+        run: |
+          mkdir -p $HOME/.cabal/bin
+          curl -sL https://github.com/haskell-hvr/cabal-plan/releases/download/v0.6.2.0/cabal-plan-0.6.2.0-x86_64-linux.xz > cabal-plan.xz
+          echo 'de73600b1836d3f55e32d80385acc055fd97f60eaa0ab68a755302685f5d81bc  cabal-plan.xz' | sha256sum -c -
+          xz -d < cabal-plan.xz > $HOME/.cabal/bin/cabal-plan
+          rm -f cabal-plan.xz
+          chmod a+x $HOME/.cabal/bin/cabal-plan
+          cabal-plan --version
+      - name: checkout
+        uses: actions/checkout@v2
+        with:
+          path: source
+      - name: initial cabal.project for sdist
+        run: |
+          touch cabal.project
+          echo "packages: $GITHUB_WORKSPACE/source/." >> cabal.project
+          cat cabal.project
+      - name: sdist
+        run: |
+          mkdir -p sdist
+          $CABAL sdist all --output-dir $GITHUB_WORKSPACE/sdist
+      - name: unpack
+        run: |
+          mkdir -p unpacked
+          find sdist -maxdepth 1 -type f -name '*.tar.gz' -exec tar -C $GITHUB_WORKSPACE/unpacked -xzvf {} \;
+      - name: generate cabal.project
+        run: |
+          PKGDIR_ini="$(find "$GITHUB_WORKSPACE/unpacked" -maxdepth 1 -type d -regex '.*/ini-[0-9.]*')"
+          echo "PKGDIR_ini=${PKGDIR_ini}" >> "$GITHUB_ENV"
+          rm -f cabal.project cabal.project.local
+          touch cabal.project
+          touch cabal.project.local
+          echo "packages: ${PKGDIR_ini}" >> cabal.project
+          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "package ini" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
+          cat >> cabal.project <<EOF
+          EOF
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(ini)$/; }' >> cabal.project.local
+          cat cabal.project
+          cat cabal.project.local
+      - name: dump install plan
+        run: |
+          $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH --dry-run all
+          cabal-plan
+      - name: cache
+        uses: actions/cache@v2
+        with:
+          key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
+          path: ~/.cabal/store
+          restore-keys: ${{ runner.os }}-${{ matrix.compiler }}-
+      - name: install dependencies
+        run: |
+          $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks --dependencies-only -j2 all
+          $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH --dependencies-only -j2 all
+      - name: build w/o tests
+        run: |
+          $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all
+      - name: build
+        run: |
+          $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --write-ghc-environment-files=always
+      - name: tests
+        run: |
+          $CABAL v2-test $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --test-show-details=direct
+      - name: cabal check
+        run: |
+          cd ${PKGDIR_ini} || false
+          ${CABAL} -vnormal check
+      - name: haddock
+        run: |
+          $CABAL v2-haddock $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH all
+      - name: unconstrained build
+        run: |
+          rm -f cabal.project.local
+          $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all
diff --git a/ini.cabal b/ini.cabal
index 1b8ed3e..281c323 100644
--- a/ini.cabal
+++ b/ini.cabal
@@ -1,6 +1,6 @@
 cabal-version:       >= 1.10
 name:                ini
-version:             0.4.2.20220416
+version:             0.4.2.1
 synopsis:            Configuration files in the INI format.
 description:         Quick and easy configuration files in the INI format.
 license:             BSD3
@@ -13,6 +13,22 @@ copyright:           2013 Chris Done
 category:            Data, Configuration
 build-type:          Simple
 
+tested-with:
+  GHC == 9.2.2
+  GHC == 9.0.2
+  GHC == 8.10.7
+  GHC == 8.8.4
+  GHC == 8.6.5
+  GHC == 8.4.4
+  GHC == 8.2.2
+  GHC == 8.0.2
+  GHC == 7.10.3
+  GHC == 7.8.4
+  GHC == 7.6.3
+  GHC == 7.4.2
+  GHC == 7.2.2
+  GHC == 7.0.4
+
 library
   hs-source-dirs:    src/
   exposed-modules:   Data.Ini