diff --git a/.github/workflows/build-and-test.yaml b/.github/workflows/build-and-test.yaml
index 0ba7568..d35eb6d 100644
--- a/.github/workflows/build-and-test.yaml
+++ b/.github/workflows/build-and-test.yaml
@@ -45,7 +45,7 @@ jobs:
     strategy:
       matrix:
         arch: [aarch64, ppc64le]
-        build: [cp36-*, cp37-*, cp38-*, cp39-*, cp310-*, cp311-*, cp312-*]
+        build: [cp36-*, cp37-*, cp38-*, cp39-*, cp310-*, cp311-*, cp312-*, cp313-*]
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
diff --git a/amplpy/tests/test_ampl.py b/amplpy/tests/test_ampl.py
index 5a97876..ebd0aaa 100644
--- a/amplpy/tests/test_ampl.py
+++ b/amplpy/tests/test_ampl.py
@@ -427,7 +427,7 @@ def test_get_iis(self):
             r"""
             var x >= 0;
             var y{1..2} >= 0;
-            maximize obj: x+y[1]+y[2];
+            maximize obj: 0;
             s.t. s: x+y[1] <= -5;
             """
         )