diff --git a/.travis.yml b/.travis.yml
index 5751636..3db6438 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,104 +1,51 @@
-# This Travis job script has been generated by a script via
-#
-#   runghc make_travis_yml_2.hs 'validationt.cabal'
-#
-# For more information, see https://github.com/hvr/multi-ghc-travis
-#
-language: c
-sudo: false
+sudo: true
+language: haskell
 
 git:
-  submodules: false  # whether to recursively clone submodules
+  depth: 5
+
+cabal: "2.4"
 
 cache:
   directories:
-    - $HOME/.cabal/packages
-    - $HOME/.cabal/store
-
-before_cache:
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/build-reports.log
-  # remove files that are regenerated by 'cabal update'
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/00-index.*
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/*.json
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.cache
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar.idx
-
-  - rm -rfv $HOME/.cabal/packages/head.hackage
+  - "$HOME/.cabal/store"
+  - "$HOME/.stack"
+  - "$TRAVIS_BUILD_DIR/.stack-work"
 
 matrix:
   include:
-    - compiler: "ghc-7.10.3"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-7.10.3], sources: [hvr-ghc]}}
-    - compiler: "ghc-8.0.2"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.0.2], sources: [hvr-ghc]}}
-    - compiler: "ghc-8.2.2"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.2.2], sources: [hvr-ghc]}}
-    - compiler: "ghc-8.4.1"
-    # env: TEST=--disable-tests BENCH=--disable-benchmarks
-      addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.4.1], sources: [hvr-ghc]}}
 
-before_install:
-  - HC=${CC}
-  - HCPKG=${HC/ghc/ghc-pkg}
-  - unset CC
-  - ROOTDIR=$(pwd)
-  - mkdir -p $HOME/.local/bin
-  - "PATH=/opt/ghc/bin:/opt/ghc-ppa-tools/bin:$HOME/local/bin:$PATH"
-  - HCNUMVER=$(( $(${HC} --numeric-version|sed -E 's/([0-9]+)\.([0-9]+)\.([0-9]+).*/\1 * 10000 + \2 * 100 + \3/') ))
-  - echo $HCNUMVER
+  # Cabal
+  - ghc: 8.4.4
+  - ghc: 8.6.5
+
+  # Stack
+  - ghc: 8.6.5
+    env: STACK_YAML="$TRAVIS_BUILD_DIR/stack.yaml"
 
 install:
-  - cabal --version
-  - echo "$(${HC} --version) [$(${HC} --print-project-git-commit-id 2> /dev/null || echo '?')]"
-  - BENCH=${BENCH---enable-benchmarks}
-  - TEST=${TEST---enable-tests}
-  - HADDOCK=${HADDOCK-true}
-  - INSTALLED=${INSTALLED-true}
-  - GHCHEAD=${GHCHEAD-false}
-  - travis_retry cabal update -v
-  - "sed -i.bak 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config"
-  - rm -fv cabal.project cabal.project.local
-  - grep -Ev -- '^\s*--' ${HOME}/.cabal/config | grep -Ev '^\s*$'
-  - "printf 'packages: \".\"\\n' > cabal.project"
-  - cat cabal.project
-  - if [ -f "./configure.ac" ]; then
-      (cd "." && autoreconf -i);
+  - |
+    if [ -z "$STACK_YAML" ]; then
+      ghc --version
+      cabal --version
+      cabal new-update
+      cabal new-build --enable-tests --enable-benchmarks
+    else
+      # install stack
+      curl -sSL https://get.haskellstack.org/ | sh
+
+      # build project with stack
+      stack --version
+      stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks
     fi
-  - rm -f cabal.project.freeze
-  - cabal new-build -w ${HC} ${TEST} ${BENCH} --project-file="cabal.project" --dep -j2 all
-  - cabal new-build -w ${HC} --disable-tests --disable-benchmarks --project-file="cabal.project" --dep -j2 all
-  - rm -rf .ghc.environment.* "."/dist
-  - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)
 
-# Here starts the actual work to be performed for the package under test;
-# any command which exits with a non-zero exit code causes the build to fail.
 script:
-  # test that source-distributions can be generated
-  - (cd "." && cabal sdist)
-  - mv "."/dist/validationt-*.tar.gz ${DISTDIR}/
-  - cd ${DISTDIR} || false
-  - find . -maxdepth 1 -name '*.tar.gz' -exec tar -xvf '{}' \;
-  - "printf 'packages: validationt-*/*.cabal\\n' > cabal.project"
-  - cat cabal.project
-  # this builds all libraries and executables (without tests/benchmarks)
-  - cabal new-build -w ${HC} --disable-tests --disable-benchmarks all
+  - |
+    if [ -z "$STACK_YAML" ]; then
+      cabal new-test --enable-tests
+    else
+      stack test --system-ghc
+    fi
 
-  # Build with installed constraints for packages in global-db
-  - if $INSTALLED; then echo cabal new-build -w ${HC} --disable-tests --disable-benchmarks $(${HCPKG} list --global --simple-output --names-only | sed 's/\([a-zA-Z0-9-]\{1,\}\) */--constraint="\1 installed" /g') all | sh; else echo "Not building with installed constraints"; fi
-
-  # build & run tests, build benchmarks
-  - cabal new-build -w ${HC} ${TEST} ${BENCH} all
-
-  # cabal check
-  - (cd validationt-* && cabal check)
-
-  # haddock
-  - rm -rf ./dist-newstyle
-  - if $HADDOCK; then cabal new-haddock -w ${HC} ${TEST} ${BENCH} all; else echo "Skipping haddock generation";fi
-
-# REGENDATA ["validationt.cabal"]
-# EOF
+notifications:
+  email: false
diff --git a/validationt.cabal b/validationt.cabal
index 09db8c2..58e636c 100644
--- a/validationt.cabal
+++ b/validationt.cabal
@@ -15,10 +15,8 @@ category:            Control
 build-type:          Simple
 extra-source-files:  ChangeLog.md
 cabal-version:       >=1.10
-tested-with:         GHC == 7.10.3
-                   , GHC == 8.0.2
-                   , GHC == 8.2.2
-                   , GHC == 8.4.1
+tested-with:         GHC == 8.4.4
+                   , GHC == 8.6.5
 
 source-repository head
   type:     git