diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 42888f3d..05e1e24c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,11 +1,15 @@
 name: CI
-on: [push, pull_request]
+on:
+  push:
+    branches: [ master, "v0.3.x" ]
+  pull_request:
+    branches: [ master, "v0.3.x" ]
 env:
   CARGO_TERM_COLOR: always
   RUST_BACKTRACE: full
 
 jobs:
-  test:
+  Test:
     name: Test
     runs-on: ${{ matrix.os }}
     strategy:
@@ -32,34 +36,42 @@ jobs:
     - name: Install Rust (rustup)
       run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
       shell: bash
-    - run: cargo test
-    - run: cargo test --features all
+    - name: Install cargo-hack
+      run: cargo install cargo-hack
+    - name: Run tests
+      run: cargo hack test --feature-powerset && cargo hack test --feature-powerset --release
 
-  rustfmt:
+  Rustfmt:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
     - name: Install Rust
       run: rustup update stable && rustup default stable && rustup component add rustfmt
-    - run: cargo fmt -- --check
+    - name: Check formatting
+      run: cargo fmt --all -- --check
 
-  check:
+  Check:
     name: Check
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        target: [x86_64-unknown-redox, x86_64-fuchsia]
+        # TODO: add the following targets, currently broken.
+        # "x86_64-fuchsia"
+        # "x86_64-unknown-redox"
+        target: ["aarch64-apple-ios", "aarch64-linux-android", "x86_64-apple-darwin", "x86_64-pc-windows-msvc", "x86_64-sun-solaris", "x86_64-unknown-freebsd", "x86_64-unknown-linux-gnu", "x86_64-unknown-netbsd"]
     steps:
     - uses: actions/checkout@master
     - name: Install Rust
-      run: rustup update nightly && rustup default nightly
-    - run: rustup target add ${{ matrix.target }}
-    - run: cargo check --target ${{ matrix.target }} --all-targets --examples --bins --tests --no-default-features
-    - run: cargo check --target ${{ matrix.target }} --all-targets --examples --bins --tests --all-features
-      continue-on-error: true
+      run: rustup update stable && rustup default stable
+    - name: Install cargo-hack
+      run: cargo install cargo-hack
+    - name: Install Target
+      run: rustup target add ${{ matrix.target }}
+    - name: Run check
+      run: cargo hack check --feature-powerset --all-targets --examples --bins --tests --target ${{ matrix.target }}
 
-  publish_docs:
+  Publish_docs:
     name: Publish Documentation
     runs-on: ubuntu-latest
     steps: