diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..0ccda9f
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,38 @@
+name: Build and Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  run:
+    name: build
+    strategy:
+      fail-fast: true
+      matrix:
+        os:
+            - ubuntu-latest
+              #- macos-latest
+              #- windows-latest
+        ocaml-compiler:
+            - '4.05'
+            - '4.14'
+            - '5.0'
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@main
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+          dune-cache: true
+
+      - run: opam install -t trace --deps-only
+
+      - run: opam exec -- dune build '@install'
+
+      - run: opam exec -- dune runtest
+
diff --git a/dune-project b/dune-project
index f52d747..78001d0 100644
--- a/dune-project
+++ b/dune-project
@@ -15,7 +15,7 @@
  (name trace)
  (synopsis "A stub for tracing/observability")
  (depends
-   (ocaml (>= 4.03))
+   (ocaml (>= 4.05))
    dune)
  (tags
   (tracing observability profiling)))
diff --git a/trace.opam b/trace.opam
index e04d5bc..162e697 100644
--- a/trace.opam
+++ b/trace.opam
@@ -8,7 +8,7 @@ tags: ["tracing" "observability" "profiling"]
 homepage: "https://github.com/c-cube/trace"
 bug-reports: "https://github.com/c-cube/trace/issues"
 depends: [
-  "ocaml" {>= "4.03"}
+  "ocaml" {>= "4.05"}
   "dune" {>= "2.9"}
   "odoc" {with-doc}
 ]