diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3a3c3bc..0270fd7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,9 +2,9 @@ name: CI
 
 on:
   pull_request:
-    branches: [ main ]
+    branches: [main]
   push:
-    branches: [ main ]
+    branches: [main]
 
 jobs:
   build:
@@ -18,7 +18,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: "3.9"
 
       - name: Install Poetry
         uses: snok/install-poetry@v1
@@ -44,7 +44,11 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        poetry-version: ["1.6.1"]
+        include:
+          - python-version: "3.7"
+            poetry-version: "1.5.1"
 
     steps:
       - name: Checkout repository
@@ -53,10 +57,12 @@ jobs:
       - name: Setup python
         uses: actions/setup-python@v4
         with:
-          python-version: '${{ matrix.python-version }}'
+          python-version: "${{ matrix.python-version }}"
 
       - name: Install Poetry
         uses: snok/install-poetry@v1
+        with:
+          version: "${{ matrix.poetry-version }}"
 
       - name: Install dependencies
         run: poetry install