diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ceb8dd3..132af3e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,6 +47,7 @@ jobs:
     - name: Install Poetry
       uses: snok/install-poetry@v1
       with:
+        version: 1.8.4
         virtualenvs-create: true
         virtualenvs-in-project: true
         installer-parallel: true