diff --git a/.github/workflows/cbindgen.yml b/.github/workflows/cbindgen.yml
index 16e527d..099d889 100644
--- a/.github/workflows/cbindgen.yml
+++ b/.github/workflows/cbindgen.yml
@@ -30,6 +30,16 @@ jobs:
         command: fmt
         args: -- --check
 
+    - name: Install minimum supported Rust version
+      uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: 1.40.0
+
+    - name: Build with minimum supported Rust version
+      run: |
+        cargo +1.40.0 build --verbose
+
   build:
 
     runs-on: ubuntu-latest