diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3f78646..b7b4875 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,6 +1,6 @@
 name: GH
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   CI:
@@ -10,7 +10,7 @@ jobs:
       matrix:
         python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
@@ -48,7 +48,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
 
     - name: Set up Python 3.8
       uses: actions/setup-python@v1