diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..013e2a2
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,32 @@
+name: ci
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  run:
+    name: Build
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          #- windows-latest
+          - macos-latest
+        ocaml-compiler:
+          - 4.08.x
+          #- 4.12.x
+          - 5.1.x
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ocaml/setup-ocaml@v2
+      with:
+        ocaml-compiler: ${{ matrix.ocaml-compiler }}
+        dune-cache: true
+        allow-prerelease-opam: true
+    - run: opam pin -n .
+    - run: opam depext -yt printbox printbox-html printbox-md printbox-text
+    - run: opam install -t . --deps-only
+    - run: opam exec -- dune build @all
+    - run: opam exec -- dune runtest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba20de2..2db07e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - PrintBox Markdown backend.
 - Optionally, log to multiple files, opening a new file once a file size threshold is exceeded.
+- Continuous Integration tests.
 
 ### Changed