diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fb80bfb..5f7f9f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,3 +22,15 @@ jobs:
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+    - name: Build pure-rust
+      run: cargo build --verbose --features=pure-rust
+    - name: Run pure-rust tests
+      run: cargo test --verbose --features=pure-rust
+    - name: Build no-std
+      run: cargo build --verbose --no-default-features
+    - name: Run no-std tests
+      run: cargo test --verbose --no-default-features
+    - name: Build pure-rust no-std
+      run: cargo build --verbose --no-default-features --features=pure-rust
+    - name: Run pure-rust no-std tests
+      run: cargo test --verbose --no-default-features --features=pure-rust