diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 4317bc3..e9c6025 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -16,6 +16,17 @@ jobs:
     - uses: actions/checkout@v2
     - name: Check semver
       uses: obi1kenobi/cargo-semver-checks-action@v2
+  msrv:
+    runs-on: macos-11.0
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: 1.56.1
+        override: true
+    - name: Build
+      run: cargo build --verbose
   build:
     runs-on: ${{ matrix.os }}
     strategy: