diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 647afee..619a4c0 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -23,7 +23,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Poetry
-        run: pipx install poetry
+        run: pipx install poetry==1.5.1
 
       - name: Set up Python
         uses: actions/setup-python@v5