diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 73d20ea..bb6035e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,39 +1,43 @@
 name: CI
 
-on: ["push", "pull_request"]
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
 
 jobs:
   tests:
     name: Tests
     runs-on: ubuntu-latest
     steps:
-    - name: Install rust
-      uses: actions-rs/toolchain@v1
-      with:
-        toolchain: nightly
-        override: true
-    - uses: actions/checkout@v2
-    - name: Ready cache
-      run: sudo chown -R $(whoami):$(id -ng) ~/.cargo/
-    - name: Cache cargo
-      uses: actions/cache@v1
-      id: cache
-      with:
-        path: ~/.cargo
-        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
-    - name: Run tests
-      uses: actions-rs/cargo@v1
-      with:
-        command: test
-    - name: Install cargo-cache
-      uses: actions-rs/install@v0.1
-      if: steps.cache.outputs.cache-hit != 'true'
-      with:
-        crate: cargo-cache
-        use-tool-cache: true
-    - name: Cleanup cache
-      if: steps.cache.outputs.cache-hit != 'true'
-      run: cargo cache -a
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+      - uses: actions/checkout@v2
+      - name: Ready cache
+        run: sudo chown -R $(whoami):$(id -ng) ~/.cargo/
+      - name: Cache cargo
+        uses: actions/cache@v1
+        id: cache
+        with:
+          path: ~/.cargo
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+      - name: Run tests
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+      - name: Install cargo-cache
+        uses: actions-rs/install@v0.1
+        if: steps.cache.outputs.cache-hit != 'true'
+        with:
+          crate: cargo-cache
+          use-tool-cache: true
+      - name: Cleanup cache
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: cargo cache -a
   fmt:
     name: Rustfmt
     runs-on: ubuntu-latest
@@ -78,5 +82,5 @@ jobs:
       - name: Run cargo-udeps
         uses: aig787/cargo-udeps-action@v1
         with:
-          version: 'latest'
-          args: '--all-targets'
+          version: "latest"
+          args: "--all-targets"