diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ee30a2b6..c33e62d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11", "3.12"]
+        # remember to update the envlist in tox.ini too
+        python-version: ["3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/tox.ini b/tox.ini
index dcbd59e7..994319c5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{312, 311}
+envlist = py{313, 312, 311}
 toxworkdir = {env:TOX_WORK_DIR:.tox}
 
 [testenv]