diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index 7a6a8a8..00b5451 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -63,7 +63,7 @@ jobs:
     steps:
       - name: Determine matrix
         id: generate_matrix
-        uses: coactions/dynamic-matrix@v3
+        uses: coactions/dynamic-matrix@v4
         with:
           min_python: ${{ inputs.min_python }}
           max_python: ${{ inputs.max_python }}