diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8dd5be5..ae064ae 100755
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -2,7 +2,11 @@ name: check
 
 on: 
   push:
-    branches: [master]
+    paths:
+      - "OiRunner/**"
+      - "tests/**"
+      - "setup.py"
+      - ".github/workflows/**"
   pull_request:
     paths:
       - "OiRunner/**"
@@ -14,7 +18,7 @@ jobs:
   build:
     strategy:
       matrix:
-        python-version: ['3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
         os: [ubuntu-latest, windows-latest]
     
     runs-on: ${{ matrix.os }}
diff --git a/OiRunner/BetterRunner.py b/OiRunner/BetterRunner.py
index f6fa2ac..17985f0 100755
--- a/OiRunner/BetterRunner.py
+++ b/OiRunner/BetterRunner.py
@@ -5,6 +5,7 @@
 import os
 import shutil
 import time
+from typing import Optional
 
 
 class Functions:
@@ -127,7 +128,7 @@ def compile(self) -> None:
             sys.exit()
 
     def _check(self, opt_file: str, ipt_file: str, ans_file: str,
-               file_num: int = 0, run_file: str | None = None, if_print: bool | None = None) -> bool:
+               file_num: int = 0, run_file: Optional[str] = None, if_print: Optional[bool] = None) -> bool:
         '''
         Local evaluation and get results.