diff --git a/.github/workflows/python-installation.yml b/.github/workflows/python-installation.yml
index eeb8ac2..520b219 100644
--- a/.github/workflows/python-installation.yml
+++ b/.github/workflows/python-installation.yml
@@ -4,10 +4,14 @@ on: [push]
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-12]
+        py-version: [3.7, 3.8, 3.9]
+    runs-on: ${{ matrix.os}}    
     steps:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: 3.7
+        python-version: ${{matrix.py-version }}
         
\ No newline at end of file
diff --git a/README.md b/README.md
index d819d90..c22f438 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-# lab2
\ No newline at end of file
+# lab2 push
\ No newline at end of file