diff --git a/.github/workflows/run-tests.yaml b/.github/workflows/run-tests.yaml
index 27fc519..59bb3d9 100644
--- a/.github/workflows/run-tests.yaml
+++ b/.github/workflows/run-tests.yaml
@@ -14,6 +14,9 @@ on:
     - dev
   workflow_dispatch:
 
+env:
+  POETRY_VERSION: 1.6.1
+
 jobs:
   test:
     runs-on: ${{ matrix.os }}
@@ -22,7 +25,6 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.9", "3.10"]
-        poetry-version: [1.6.1]
         os: [ubuntu-22.04, macOS-latest, windows-latest]
 
     steps:
@@ -34,7 +36,7 @@ jobs:
     - name: Run poetry image
       uses: abatilo/actions-poetry@v2.0.0
       with:
-          poetry-version: ${{ matrix.poetry-version }}
+          poetry-version: $POETRY_VERSION
     - name: Install dependencies
       run: |
         poetry install --with dev
@@ -45,8 +47,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ${{ matrix.python-version }}
-        poetry-version: ${{ matrix.poetry-version }}
+        # only support specific python version, as guidelines differ beween (minor) versions
+        python-version: ["3.10.13"]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -57,7 +59,7 @@ jobs:
       - name: Run poetry image
         uses: abatilo/actions-poetry@v2.0.0
         with:
-          poetry-version: ${{ matrix.poetry-version }}
+          poetry-version: $POETRY_VERSION
       - name: Install dependencies
         run: poetry install --with dev
       - name: Run black