diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index fd5b36e9..bf9c5741 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -536,7 +536,7 @@ jobs:
 
   clang_TSAN:
     runs-on: ubuntu-24.04
-    container: ghcr.io/nascheme/numpy-tsan:3.14t
+    container: ghcr.io/nascheme/numpy-tsan:3.15t-dev
     steps:
     - uses: actions/checkout@v4
 
@@ -547,7 +547,6 @@ jobs:
 
     - name: run tests under pytest-run-parallel
       run: |
-        TSAN_OPTIONS="suppressions=$PWD/suppressions_free_threading.txt" \
         python -m pytest --parallel-threads=4 --skip-thread-unsafe=True -sv
 
   check:
diff --git a/pyproject.toml b/pyproject.toml
index 447621fb..ffe9e795 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,3 +48,7 @@ Download = "https://github.com/python-cffi/cffi/releases"
 Contact = "https://groups.google.com/forum/#!forum/python-cffi"
 "Source Code" = "https://github.com/python-cffi/cffi"
 "Issue Tracker" = "https://github.com/python-cffi/cffi/issues"
+
+[pytest]
+faulthandler_timeout = 600
+faulthandler_exit_on_timeout = true
\ No newline at end of file
diff --git a/suppressions_free_threading.txt b/suppressions_free_threading.txt
deleted file mode 100644
index 4437b870..00000000
--- a/suppressions_free_threading.txt
+++ /dev/null
@@ -1,52 +0,0 @@
-# This file contains suppressions for the free-threaded build. It contains the
-# suppressions for the default build and additional suppressions needed only in
-# the free-threaded build.
-#
-# reference: https://github.com/google/sanitizers/wiki/ThreadSanitizerSuppressions
-
-## Free-threaded suppressions
-
-
-# These entries are for warnings that trigger in a library function, as called
-# by a CPython function.
-
-# These warnings trigger directly in a CPython function.
-
-race_top:dump_traceback
-race_top:fatal_error
-race_top:_PyFrame_GetCode
-race_top:_PyFrame_Initialize
-race_top:_PyObject_TryGetInstanceAttribute
-race_top:PyUnstable_InterpreterFrame_GetLine
-race_top:write_thread_id
-
-# gh-129068: race on shared range iterators (test_free_threading.test_zip.ZipThreading.test_threading)
-race_top:rangeiter_next
-
-# gh-129748: test.test_free_threading.test_slots.TestSlots.test_object
-race_top:mi_block_set_nextx
-
-# https://gist.github.com/mpage/6962e8870606cfc960e159b407a0cb40
-thread:pthread_create
-
-# Range iteration is not thread-safe yet (issue #129068)
-race_top:rangeiter_next
-
-# List resizing happens through different paths ending in memcpy or memmove
-# (for efficiency), which will probably need to rewritten as explicit loops
-# of ptr-sized copies to be thread-safe. (Issue #129069)
-race:list_ass_slice_lock_held
-race:list_inplace_repeat_lock_held
-
-# PyObject_Realloc internally does memcpy which isn't atomic so can race
-# with non-locking reads. See #132070
-race:PyObject_Realloc
-
-# gh-133467.  Some of these could be hard to trigger.
-race_top:_Py_slot_tp_getattr_hook
-race_top:slot_tp_descr_get
-race_top:type_set_name
-race_top:set_tp_bases
-race_top:type_set_bases_unlocked
-
-race:partial_vectorcall_fallback