diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index d6f930d..e6031d0 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -22,6 +22,7 @@ jobs:
           - [ubuntu-20.04, "3.10", "CONVTOOLS_CEXT_DISABLED=1"]
           - [ubuntu-20.04, "3.11", "CONVTOOLS_CEXT_DISABLED=1"]
           - [ubuntu-20.04, "3.12", "CONVTOOLS_CEXT_DISABLED=1"]
+          - [ubuntu-20.04, "3.13", "CONVTOOLS_CEXT_DISABLED=1"]
           - [ubuntu-20.04, "3.10", "CONVTOOLS_CEXT_DISABLED=0"]
     runs-on: ${{ matrix.os-python-env[0] }}
     steps: