diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a2fbc22..a6abe09 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [main]
 
+env:
+  PYTHON_VERSION: "3.10"
+  POETRY_VERSION: "1.3.2"
+
 jobs:
   main:
     name: Test and release
@@ -16,29 +20,30 @@ jobs:
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
-      - name: Set up Python 3.10
+      - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: ${{ env.PYTHON_VERSION }}
       - name: Cache poetry
         id: cache-poetry
         uses: actions/cache@v3
         with:
           path: ~/.local
-          key: poetry-${{ runner.os }}
+          key: poetry-${{ runner.os }}-${{ env.PYTHON_VERSION }}-${{ env.POETRY_VERSION }}
       - name: Install poetry
         if: steps.cache-poetry.outputs.cache-hit != 'true'
         uses: snok/install-poetry@v1
         with:
+          version: ${{ env.POETRY_VERSION }}
           virtualenvs-in-project: true
       - name: Cache venv
         id: cache-venv
         uses: actions/cache@v3
         with:
           path: .venv
-          key: venv-${{ runner.os }}-${{ hashFiles('poetry.lock') }}
+          key: venv-${{ runner.os }}-${{ env.PYTHON_VERSION }}-${{ env.POETRY_VERSION }}-${{ hashFiles('poetry.lock') }}
           restore-keys: |
-            venv-${{ runner.os }}-
+            venv-${{ runner.os }}-${{ env.PYTHON_VERSION }}-${{ env.POETRY_VERSION }}-
       - name: Install dependencies
         if: steps.cache-venv.outputs.cache-hit != 'true'
         run: poetry install