diff --git a/.github/workflows/pytest_fast.yml b/.github/workflows/pytest_fast.yml
index d3cb4a8d..2beebb95 100644
--- a/.github/workflows/pytest_fast.yml
+++ b/.github/workflows/pytest_fast.yml
@@ -14,6 +14,14 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Set up Poetry
+        uses: Gr1N/setup-poetry@v9
+        with:
+          poetry-version: "1.8.4"
+
+      - name: Check Poetry lock file is current
+        run: poetry check
+
       - uses: hynek/build-and-inspect-python-package@v2
         env:
           # Pass in dummy version '0.0.0dev0' version to appease dynamic versioning
@@ -36,7 +44,7 @@ jobs:
       - name: Set up Poetry
         uses: Gr1N/setup-poetry@v9
         with:
-          poetry-version: "1.7.1"
+          poetry-version: "1.8.4"
       - name: Set up Python
         uses: actions/setup-python@v5
         with: