diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 676df43..19c2ded 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,15 +16,11 @@ jobs:
     runs-on: ${{ matrix.image }}
     strategy:
       matrix:
-        os: [Ubuntu, macOS, Windows]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        os: [Windows]
+        python-version: ["3.12"]
         include:
-          - os: Ubuntu
-            image: ubuntu-latest
           - os: Windows
             image: windows-2022
-          - os: macOS
-            image: macos-11
       fail-fast: false
     defaults:
       run:
@@ -44,7 +40,7 @@ jobs:
 
       - name: Bootstrap poetry
         run: |
-          curl -sL https://install.python-poetry.org | python - -y ${{ matrix.bootstrap-args }}
+          curl -sL https://install.python-poetry.org | python - -y --git https://github.com/radoering/poetry.git@debug-build-error
 
       - name: Update PATH
         if: ${{ matrix.os != 'Windows' }}
@@ -57,22 +53,5 @@ jobs:
       - name: Configure poetry
         run: poetry config virtualenvs.in-project true
 
-      - name: Set up cache
-        uses: actions/cache@v3
-        id: cache
-        with:
-          path: .venv
-          key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
-
-      - name: Ensure cache is healthy
-        if: steps.cache.outputs.cache-hit == 'true'
-        run: timeout 10s poetry run pip --version || rm -rf .venv
-
       - name: Install dependencies
         run: poetry install --with github-actions
-
-      - name: Run mypy
-        run: poetry run mypy
-
-      - name: Run pytest
-        run: poetry run pytest -v