diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..d157e90
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,45 @@
+name: test
+
+on:
+  push:
+  pull_request:
+  schedule: [cron: "40 1 * * *"]
+
+jobs:
+  test:
+    name: Rust ${{matrix.rust}}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [nightly, beta, stable, 1.26.0]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{matrix.rust}}
+      - run: cargo build
+      - run: cargo build --features i128
+      - run: cargo test --features i128
+      - run: cargo test --features i128 --release
+      - run: cargo build --no-default-features --features i128
+      - run: cargo test --tests --no-default-features --features i128
+      - run: cargo test --tests --no-default-features --features i128 --release
+      - run: cargo bench --no-run --features i128
+        if: matrix.rust == 'nightly'
+
+  mintest:
+    name: Rust 1.20.0
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dtolnay/rust-toolchain@1.20.0
+      - run: cargo test
+
+  msrv:
+    name: Rust 1.0.0
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dtolnay/rust-toolchain@1.0.0
+      - run: cargo build