diff --git a/.github/workflows/ci-conda-known-test-failures.json b/.github/workflows/ci-conda-known-test-failures.json
index 24dfaed0e54..bfb92de3e15 100644
--- a/.github/workflows/ci-conda-known-test-failures.json
+++ b/.github/workflows/ci-conda-known-test-failures.json
@@ -41,6 +41,9 @@
     "sage.modular.modform.l_series_gross_zagier": {
         "failed": "unreported failure seen in https://github.com/sagemath/sage/actions/runs/6859244281/job/18651257775#step:11:10102"
     },
+    "sage.numerical.linear_tensor_element": {
+        "failed": "random segfaults https://github.com/sagemath/sage/issues/28559"
+    },
     "sage.parallel.map_reduce": {
         "failed": "random failure https://github.com/sagemath/sage/issues/36939"
     },