diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..2ebc7b5
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,63 @@
+name: CI
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+jobs:
+  build:
+    strategy:
+      matrix:
+        os:
+          - macos-10.15
+          - ubuntu-18.04
+          - windows-2019
+        ghc:
+          - 8.8.4
+        cabal:
+          - 3.2.0.0
+        include:
+          - os: ubuntu-18.04
+            ghc: 8.6.5
+            cabal: 3.2.0.0
+          - os: ubuntu-18.04
+            ghc: 8.4.4
+            cabal: 3.2.0.0
+          - os: ubuntu-18.04
+            ghc: 8.2.2
+            cabal: 3.2.0.0
+          - os: ubuntu-18.04
+            ghc: 8.0.2
+            cabal: 3.2.0.0
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - id: setup-haskell
+        uses: actions/setup-haskell@v1
+        with:
+          ghc-version: ${{ matrix.ghc }}
+          cabal-version: ${{ matrix.cabal }}
+      - run: cabal freeze
+      - run: cat cabal.project.freeze
+      - uses: actions/cache@v2
+        with:
+          path: ${{ steps.setup-haskell.outputs.cabal-store }}
+          key: ${{ matrix.os }}-${{ matrix.ghc }}-${{ matrix.cabal }}-${{ hashFiles('cabal.project.freeze') }}
+          restore-keys: |
+            ${{ matrix.os }}-${{ matrix.ghc }}-${{ matrix.cabal }}-
+            ${{ matrix.os }}-${{ matrix.ghc }}-
+      - run: cabal test --test-show-details direct
+      - run: cabal install --installdir output --install-method copy
+      - run: strip output/brittany*
+      - uses: actions/upload-artifact@v2
+        with:
+          path: output/brittany*
+          name: brittany-${{ matrix.os }}-ghc-${{ matrix.ghc }}-${{ github.sha }}
+      - if: matrix.os == 'ubuntu-18.04' && matrix.ghc == '8.8.4'
+        uses: actions/upload-artifact@v2
+        with:
+          path: dist-newstyle/sdist/brittany-*.tar.gz
+          name: brittany-${{ github.sha }}.tar.gz
+      - run: cabal check
diff --git a/output/.gitignore b/output/.gitignore
new file mode 100644
index 0000000..d6b7ef3
--- /dev/null
+++ b/output/.gitignore
@@ -0,0 +1,2 @@
+*
+!.gitignore
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 6b3c445..6a1ae68 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -33,12 +33,12 @@ packages:
   original:
     hackage: strict-list-0.1.4
 - completed:
-    hackage: ghc-exactprint-0.5.8.2@sha256:b078e02ce263db6214f8418c8b6f6be1c8a7ca1499bb2f8936b91b5ed210faa5,7901
+    hackage: ghc-exactprint-0.6.2@sha256:d822f64351e9a8e03d9bad35c8fdf558d30dc396801b396c52b5d5bffaee9108,8368
     pantry-tree:
-      size: 83871
-      sha256: 1dc1dc7f036dfb8e7642deaeb2845c62731085abc29a1494c22cd6b1b5a18d16
+      size: 85384
+      sha256: d904de9c01e58bfa091d7caa09e0423e9d2932b7b3490c4d83140731f4473877
   original:
-    hackage: ghc-exactprint-0.5.8.2
+    hackage: ghc-exactprint-0.6.2
 snapshots:
 - completed:
     size: 499461