diff --git a/.github/workflows/CI_build.yml b/.github/workflows/CI_build.yml
index 8e7176a..ec731d8 100644
--- a/.github/workflows/CI_build.yml
+++ b/.github/workflows/CI_build.yml
@@ -17,11 +17,11 @@ jobs:
     name: first code check / python-3.8 / ubuntu-latest
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python
-        uses: actions/setup-python@v1
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: 3.9
       - name: Python info
         run: |
           which python
@@ -49,11 +49,11 @@ jobs:
     runs-on: ubuntu-latest
     needs: first_check
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.7
-        uses: actions/setup-python@v1
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.7
+          python-version: 3.9
       - name: Python info
         run: |
           which python
@@ -93,10 +93,10 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
-        python-version: ['3.7', '3.8', '3.9']
+        python-version: ['3.8', '3.9', '3.10', '3.11']
         exclude:
           - os: ubuntu-latest
-            python-version: 3.8 # or 3.9 when #240 is fully solved 
+            python-version: 3.9 
     steps:
       - uses: actions/checkout@v2
         with: