diff --git a/.github/workflows/tsan-suppressions.txt b/.github/workflows/tsan-suppressions_3.13.txt
similarity index 93%
rename from .github/workflows/tsan-suppressions.txt
rename to .github/workflows/tsan-suppressions_3.13.txt
index bdffddc58..833fa856a 100644
--- a/.github/workflows/tsan-suppressions.txt
+++ b/.github/workflows/tsan-suppressions_3.13.txt
@@ -21,6 +21,10 @@ race:_PyUnicode_InternImmortal
 # Fixed in Python 3.14, but not backported to 3.13.
 race_top:PyMember_GetOne
 
+# https://github.com/python/cpython/issues/131680
+# Fixed in Python 3.14, but not backported to 3.13.
+race_top: new_reference
+
 # https://github.com/python/cpython/issues/129748
 race:mi_block_set_nextx
 
diff --git a/.github/workflows/tsan-suppressions_3.14.txt b/.github/workflows/tsan-suppressions_3.14.txt
new file mode 100644
index 000000000..9cfc68e1a
--- /dev/null
+++ b/.github/workflows/tsan-suppressions_3.14.txt
@@ -0,0 +1,26 @@
+# false-positive caused because we haven't tsan-instrumented libgcc_s. Multiple threads
+# are racing on a call to __register_frame_info(), but that function appears to be correctly locked internally.
+race:llvm::RuntimeDyldELF::registerEHFrames
+
+# https://github.com/openxla/xla/issues/20686
+race:dnnl_sgemm
+
+# https://github.com/python/cpython/issues/128050
+race:partial_vectorcall_fallback
+
+# Likely only happens when the process is crashing.
+race:dump_traceback
+
+# https://github.com/python/cpython/issues/129748
+race:mi_block_set_nextx
+
+# https://github.com/python/cpython/issues/128130
+race_top:run_eval_code_obj
+
+# Races because the LAPACK and BLAS in our scipy isn't TSAN instrumented.
+race:heevd_ffi
+race:gesdd_ffi
+race:dscal_k_
+race:scal_k_
+race:gemm_beta
+race:gemm_oncopy
diff --git a/.github/workflows/tsan.yaml b/.github/workflows/tsan.yaml
index cd59c0bf4..4c28608a8 100644
--- a/.github/workflows/tsan.yaml
+++ b/.github/workflows/tsan.yaml
@@ -22,6 +22,16 @@ jobs:
       image: index.docker.io/library/ubuntu@sha256:b359f1067efa76f37863778f7b6d0e8d911e3ee8efa807ad01fbf5dc1ef9006b # ratchet:ubuntu:24.04
     strategy:
       fail-fast: false
+      matrix:
+        include:
+          - name-prefix: "with 3.13"
+            python-version: "3.13"
+            github_branch: "3.13"
+            requirements_lock_name: "requirements_lock_3_13_ft"
+          - name-prefix: "with 3.14"
+            python-version: "3.14"
+            github_branch: "main"
+            requirements_lock_name: "requirements_lock_3_14_ft"
     defaults:
       run:
         shell: bash -l {0}
@@ -44,22 +54,33 @@ jobs:
         with:
           repository: python/cpython
           path: cpython
-          ref: "3.13"
+          ref: ${{ matrix.github_branch }}
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           repository: numpy/numpy
           path: numpy
           submodules: true
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        if: ${{ matrix.python-version == '3.14' }}
+        with:
+          repository: scipy/scipy
+          path: scipy
+          submodules: true
 
-      - name: Restore cached TSAN CPython
+      - name: Get year & week number
+        id: get-date
+        run: echo "date=$(/bin/date "+%Y-%U")" >> $GITHUB_OUTPUT
+        shell: bash -l {0}
+
+      - name: Restore cached TSAN CPython ${{ matrix.python-version }}
         id: cache-cpython-tsan-restore
         uses: actions/cache/restore@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
         with:
           path: |
             ./python-tsan.tgz
-          key: ${{ runner.os }}-cpython-tsan-${{ hashFiles('cpython/configure.ac') }}
+          key: ${{ runner.os }}-cpython-tsan-${{ matrix.python-version }}-${{ steps.get-date.outputs.date }}
 
-      - name: Build CPython with enabled TSAN
+      - name: Build TSAN CPython ${{ matrix.python-version }}
         if: steps.cache-cpython-tsan-restore.outputs.cache-hit != 'true'
         run: |
           cd cpython
@@ -73,19 +94,14 @@ jobs:
           # Create archive to be used with bazel as hermetic python:
           cd ${GITHUB_WORKSPACE} && tar -czpf python-tsan.tgz cpython-tsan
 
-      - name: Save TSAN CPython
+      - name: Save TSAN CPython ${{ matrix.python-version }}
         id: cache-cpython-tsan-save
         if: steps.cache-cpython-tsan-restore.outputs.cache-hit != 'true'
         uses: actions/cache/save@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
         with:
           path: |
             ./python-tsan.tgz
-          key: ${{ runner.os }}-cpython-tsan-${{ hashFiles('cpython/configure.ac') }}
-
-      - name: Get year & week number
-        id: get-date
-        run: echo "date=$(/bin/date "+%Y-%U")" >> $GITHUB_OUTPUT
-        shell: bash -l {0}
+          key: ${{ runner.os }}-cpython-tsan-${{ matrix.python-version }}-${{ steps.get-date.outputs.date }}
 
       - name: Restore cached TSAN Numpy
         id: cache-numpy-tsan-restore
@@ -93,7 +109,7 @@ jobs:
         with:
           path: |
             ./wheelhouse
-          key: ${{ runner.os }}-numpy-tsan-${{ hashFiles('numpy/pyproject.toml') }}-${{ steps.get-date.outputs.date }}
+          key: ${{ runner.os }}-numpy-tsan-${{ matrix.python-version }}-${{ hashFiles('numpy/pyproject.toml') }}-${{ steps.get-date.outputs.date }}
 
       - name: Build TSAN Numpy wheel
         if: steps.cache-numpy-tsan-restore.outputs.cache-hit != 'true'
@@ -114,7 +130,8 @@ jobs:
 
           python3 -m pip install uv~=0.5.30
           # Make sure to install a compatible Cython version (master branch is best for now)
-          python3 -m uv pip install -r requirements/build_requirements.txt -U git+https://github.com/cython/cython
+          NO_CYTHON_COMPILE=true python3 -m uv pip install -U git+https://github.com/cython/cython
+          python3 -m uv pip install -r requirements/build_requirements.txt
 
           CC=clang-18 CXX=clang++-18 python3 -m pip wheel --wheel-dir dist -v . --no-build-isolation -Csetup-args=-Db_sanitize=thread -Csetup-args=-Dbuildtype=debugoptimized
 
@@ -147,7 +164,83 @@ jobs:
         with:
           path: |
             ./wheelhouse
-          key: ${{ runner.os }}-numpy-tsan-${{ hashFiles('numpy/pyproject.toml') }}-${{ steps.get-date.outputs.date }}
+          key: ${{ runner.os }}-numpy-tsan-${{ matrix.python-version }}-${{ hashFiles('numpy/pyproject.toml') }}-${{ steps.get-date.outputs.date }}
+
+      - name: Restore cached Scipy
+        if: ${{ matrix.python-version == '3.14' }}
+        id: cache-scipy-restore
+        uses: actions/cache/restore@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+        with:
+          path: |
+            ./wheelhouse
+          key: ${{ runner.os }}-scipy-${{ matrix.python-version }}-${{ hashFiles('scipy/pyproject.toml') }}-${{ steps.get-date.outputs.date }}
+
+      - name: Build Scipy wheel
+        if: ${{ steps.cache-scipy-restore.outputs.cache-hit != 'true' && matrix.python-version == '3.14' }}
+        run: |
+          # Install scipy dependencies:
+          apt-get install -y gfortran libopenblas-dev liblapack-dev pkg-config --no-install-recommends
+
+          cd scipy
+
+          # If we restored cpython from cache, we need to get python interpreter from python-tsan.tgz
+          if [ ! -d ${GITHUB_WORKSPACE}/cpython-tsan/bin/ ]; then
+            echo "Extract cpython from python-tsan.tgz"
+            pushd .
+            ls ${GITHUB_WORKSPACE}/python-tsan.tgz
+            cd ${GITHUB_WORKSPACE} && tar -xzf python-tsan.tgz
+            ls ${GITHUB_WORKSPACE}/cpython-tsan/bin/
+            popd
+          fi
+
+          export PATH=${GITHUB_WORKSPACE}/cpython-tsan/bin/:$PATH
+
+          python3 -m pip install uv~=0.5.30
+          # Make sure to install a compatible Cython version (master branch is best for now)
+          NO_CYTHON_COMPILE=true python3 -m uv pip install -U git+https://github.com/cython/cython
+          python3 -m uv pip install -U --pre numpy --extra-index-url file://${GITHUB_WORKSPACE}/wheelhouse/
+          python3 -m uv pip install pythran pybind11 meson-python ninja
+
+          python3 -m uv pip list | grep -E "(numpy|pythran|cython|pybind11)"
+
+          export CC=clang-18
+          export CXX=clang++-18
+          python3 -m pip wheel --wheel-dir dist -vvv . --no-build-isolation --no-deps -Csetup-args=-Dbuildtype=debugoptimized
+
+          python3 -m uv pip list | grep -E "(numpy|pythran|cython|pybind11)"
+
+          # Create simple index and copy the wheel
+          mkdir -p ${GITHUB_WORKSPACE}/wheelhouse/scipy
+
+          scipy_whl_name=($(cd dist && ls scipy*.whl))
+          if [ -z "${scipy_whl_name}" ]; then exit 1; fi
+
+          echo "Built TSAN Scipy wheel: ${scipy_whl_name}"
+
+          cp dist/${scipy_whl_name} ${GITHUB_WORKSPACE}/wheelhouse/scipy
+
+          # Recreate wheelhouse index with Numpy and Scipy
+          cat << EOF > ${GITHUB_WORKSPACE}/wheelhouse/index.html
+          <!DOCTYPE html><html><body>
+          <a href="numpy">numpy></a></br>
+          <a href="scipy">scipy></a></br>
+          </body></html>
+          EOF
+
+          cat << EOF > ${GITHUB_WORKSPACE}/wheelhouse/scipy/index.html
+          <!DOCTYPE html><html><body>
+          <a href="${scipy_whl_name}">${scipy_whl_name}</a></br>
+          </body></html>
+          EOF
+
+      - name: Save Scipy wheel
+        id: cache-scipy-save
+        if: ${{ steps.cache-scipy-restore.outputs.cache-hit != 'true' && matrix.python-version == '3.14' }}
+        uses: actions/cache/save@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+        with:
+          path: |
+            ./wheelhouse
+          key: ${{ runner.os }}-scipy-${{ matrix.python-version }}-${{ hashFiles('scipy/pyproject.toml') }}-${{ steps.get-date.outputs.date }}
 
       - name: Build Jax and run tests
         timeout-minutes: 120
@@ -164,7 +257,7 @@ jobs:
 
           python3 -VV
           python3 build/build.py build --configure_only \
-            --python_version=3.13-ft \
+            --python_version=${{ matrix.python-version }}-ft \
             --bazel_options=--repo_env=HERMETIC_PYTHON_URL="file://${GITHUB_WORKSPACE}/python-tsan.tgz" \
             --bazel_options=--repo_env=HERMETIC_PYTHON_SHA256=${PYTHON_SHA256} \
             --bazel_options=--repo_env=HERMETIC_PYTHON_PREFIX="cpython-tsan/" \
@@ -174,18 +267,32 @@ jobs:
             --bazel_options=--copt=-g \
             --clang_path=/usr/bin/clang-18
 
-          # Patch build/requirements_lock_3_13_ft.txt to use TSAN instrumented NumPy
-          sed -i "s|+--extra-index-url.*|+--extra-index-url file://${GITHUB_WORKSPACE}/wheelhouse/|" .github/workflows/requirements_lock_3_13_ft.patch
-          cat .github/workflows/requirements_lock_3_13_ft.patch
-          git apply .github/workflows/requirements_lock_3_13_ft.patch || exit 1
+          if [ "${{ matrix.python-version }}" == "3.13" ]; then
+            # Patch build/requirements_lock_3_13_ft.txt to use TSAN instrumented NumPy
 
-          # Display the content for debugging in logs
-          cat build/requirements_lock_3_13_ft.txt | head -15
-          # Check the patch
-          cat build/requirements_lock_3_13_ft.txt | head -15 | grep -E "(--pre|.*${GITHUB_WORKSPACE}/wheelhouse/|numpy)"
-          if [ "$?" == "1" ]; then echo "Could not find the patch in the requirements_lock_3_13_ft.txt"; exit 1; fi
-          cat build/requirements_lock_3_13_ft.txt | grep -E "(numpy==)"
-          if [ "$?" == "0" ]; then "Found original numpy dependency in the requirements_lock_3_13_ft.txt"; exit 1; fi
+            sed -i "s|+--extra-index-url.*|+--extra-index-url file://${GITHUB_WORKSPACE}/wheelhouse/|" .github/workflows/${{ matrix.requirements_lock_name }}.patch
+            cat .github/workflows/${{ matrix.requirements_lock_name }}.patch
+            git apply .github/workflows/${{ matrix.requirements_lock_name }}.patch || exit 1
+
+            # Display the content for debugging in logs
+            cat build/${{ matrix.requirements_lock_name }}.txt | head -15
+            # Check the patch
+            cat build/${{ matrix.requirements_lock_name }}.txt | head -15 | grep -E "(--pre|.*${GITHUB_WORKSPACE}/wheelhouse/|numpy)"
+            if [ "$?" == "1" ]; then echo "Could not find the patch in the ${{ matrix.requirements_lock_name }}.txt"; exit 1; fi
+            cat build/${{ matrix.requirements_lock_name }}.txt | grep -E "(numpy==)"
+            if [ "$?" == "0" ]; then "Found original numpy dependency in the ${{ matrix.requirements_lock_name }}.txt"; exit 1; fi
+
+          else
+            # Patch build/requirements_lock_3_14_ft.txt to use TSAN instrumented NumPy and Scipy
+
+            sed -i "s|--extra-index-url.*|--extra-index-url file://${GITHUB_WORKSPACE}/wheelhouse/|" build/${{ matrix.requirements_lock_name }}.txt
+
+            # We should install jpeg dev package to be able to build Pillow from source:
+            apt-get install -y libjpeg-dev --no-install-recommends
+
+            # Install scipy runtime dependencies (in case we restore scipy wheel from cache):
+            apt-get install -y libopenblas-dev liblapack-dev --no-install-recommends
+          fi
 
           echo "JAX_NUM_GENERATED_CASES=$JAX_NUM_GENERATED_CASES"
           echo "JAX_ENABLE_X64=$JAX_ENABLE_X64"
@@ -201,13 +308,18 @@ jobs:
           # Check numpy version
           ./bazel cquery @pypi_numpy//:* | grep whl
 
+          if [ "${{ matrix.python-version }}" == "3.14" ]; then
+            # Check scipy version
+            ./bazel cquery @pypi_scipy//:* | grep whl
+          fi
+
           # Build JAX and run tests
           ./bazel test \
               --test_env=JAX_NUM_GENERATED_CASES=$JAX_NUM_GENERATED_CASES \
               --test_env=JAX_ENABLE_X64=$JAX_ENABLE_X64 \
               --test_env=JAX_SKIP_SLOW_TESTS=$JAX_SKIP_SLOW_TESTS \
               --test_env=PYTHON_GIL=0 \
-              --test_env=TSAN_OPTIONS=halt_on_error=1,suppressions=$PWD/.github/workflows/tsan-suppressions.txt \
+              --test_env=TSAN_OPTIONS=halt_on_error=1,suppressions=$PWD/.github/workflows/tsan-suppressions_${{ matrix.python-version }}.txt \
               --test_env=JAX_TEST_NUM_THREADS=8 \
               --test_output=errors \
               --local_test_jobs=32 \
diff --git a/WORKSPACE b/WORKSPACE
index a6968446a..5c093ec22 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -14,6 +14,7 @@ python_init_repositories(
         "3.12": "//build:requirements_lock_3_12.txt",
         "3.13": "//build:requirements_lock_3_13.txt",
         "3.13-ft": "//build:requirements_lock_3_13_ft.txt",
+        "3.14-ft": "//build:requirements_lock_3_14_ft.txt",
     },
     local_wheel_inclusion_list = [
         "jax-*",
diff --git a/build/build.py b/build/build.py
index f8c0ccbfa..226d984b3 100755
--- a/build/build.py
+++ b/build/build.py
@@ -496,6 +496,7 @@ async def main():
   if args.use_clang:
     clang_path = args.clang_path or utils.get_clang_path_or_exit()
     clang_major_version = utils.get_clang_major_version(clang_path)
+    clangpp_path = utils.get_clangpp_path(clang_path)
     logging.debug(
         "Using Clang as the compiler, clang path: %s, clang version: %s",
         clang_path,
@@ -505,6 +506,7 @@ async def main():
     # Use double quotes around clang path to avoid path issues on Windows.
     wheel_build_command_base.append(f"--action_env=CLANG_COMPILER_PATH=\"{clang_path}\"")
     wheel_build_command_base.append(f"--repo_env=CC=\"{clang_path}\"")
+    wheel_build_command_base.append(f"--repo_env=CXX=\"{clangpp_path}\"")
     wheel_build_command_base.append(f"--repo_env=BAZEL_COMPILER=\"{clang_path}\"")
 
     if clang_major_version >= 16:
diff --git a/build/requirements_lock_3_13_ft.txt b/build/requirements_lock_3_13_ft.txt
index 5157706c0..a96a3e6e4 100644
--- a/build/requirements_lock_3_13_ft.txt
+++ b/build/requirements_lock_3_13_ft.txt
@@ -658,7 +658,7 @@ zipp==3.21.0 \
     --hash=sha256:2c9958f6430a2040341a52eb608ed6dd93ef4392e02ffe219417c1b28b5dd1f4 \
     --hash=sha256:ac1bbe05fd2991f160ebce24ffbac5f6d11d83dc90891255885223d42b3cd931
     # via etils
-# python 3.13t can compile 0.23.0
+# python 3.13t can't compile 0.23.0
 # due to https://github.com/indygreg/python-zstandard/issues/231
 # zstandard==0.23.0 \
 #     --hash=sha256:034b88913ecc1b097f528e42b539453fa82c3557e414b3de9d5632c80439a473 \
diff --git a/build/requirements_lock_3_14_ft.txt b/build/requirements_lock_3_14_ft.txt
new file mode 100644
index 000000000..18e4ef6d5
--- /dev/null
+++ b/build/requirements_lock_3_14_ft.txt
@@ -0,0 +1,107 @@
+--pre
+--extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+numpy
+
+--pre
+--extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+scipy
+
+absl-py==2.1.0
+
+attrs==24.3.0
+
+auditwheel==6.2.0
+
+build==1.2.2.post1
+
+cloudpickle==3.1.1  # version 3.1.0 leads to recursion error
+
+colorama==0.4.6
+
+contourpy==1.3.1
+
+cycler==0.12.1
+
+etils[epath,epy]==1.11.0
+
+execnet==2.1.1
+
+filelock==3.16.1
+
+flatbuffers==24.12.23
+
+fonttools==4.56.0
+
+fsspec==2024.12.0
+
+hypothesis==6.123.9
+
+importlib-resources==6.5.2
+
+iniconfig==2.0.0
+
+kiwisolver==1.4.8
+
+markdown-it-py==3.0.0
+
+matplotlib==3.10.1
+
+mdurl==0.1.2
+
+ml-dtypes==0.5.1
+
+mpmath==1.3.0
+
+nvidia-cublas-cu12==12.8.3.14 ; sys_platform == "linux"
+
+nvidia-cuda-cupti-cu12==12.8.57 ; sys_platform == "linux"
+nvidia-cuda-nvcc-cu12==12.8.61 ; sys_platform == "linux"
+nvidia-cuda-runtime-cu12==12.8.57 ; sys_platform == "linux"
+nvidia-cudnn-cu12==9.7.1.26 ; sys_platform == "linux"
+nvidia-cufft-cu12==11.3.3.41 ; sys_platform == "linux"
+nvidia-cusolver-cu12==11.7.2.55 ; sys_platform == "linux"
+nvidia-cusparse-cu12==12.5.7.53 ; sys_platform == "linux"
+nvidia-nccl-cu12==2.25.1 ; sys_platform == "linux"
+
+nvidia-nvjitlink-cu12==12.8.61 ; sys_platform == "linux"
+opt-einsum==3.4.0
+
+packaging==24.2
+
+pillow==11.1.0
+pluggy==1.5.0
+
+portpicker==1.6.0
+
+psutil==6.1.1
+pyelftools==0.31
+
+pygments==2.19.1
+
+pyparsing==3.2.2  # version 3.2.1 fails with SyntaxError(originally SyntaxWarning): 'return' in a 'finally' block in pyparsing/core.py", line 5716
+
+pyproject-hooks==1.2.0
+
+pytest==8.3.4
+
+pytest-xdist==3.6.1
+
+python-dateutil==2.9.0.post0
+
+rich==13.9.4
+
+six==1.17.0
+
+sortedcontainers==2.4.0
+
+typing-extensions==4.12.2
+
+wheel==0.45.1
+
+zipp==3.21.0
+
+# python 3.14t can't compile 0.23.0
+# due to https://github.com/indygreg/python-zstandard/issues/231
+# zstandard==0.23.0
+
+setuptools==70.3.0
diff --git a/build/tools/utils.py b/build/tools/utils.py
index 8b8dc80d1..ccce8aff0 100644
--- a/build/tools/utils.py
+++ b/build/tools/utils.py
@@ -202,6 +202,20 @@ def get_clang_major_version(clang_path):
 
   return major_version
 
+def get_clangpp_path(clang_path):
+  clang_path = pathlib.Path(clang_path)
+  clang_exec_name = clang_path.stem
+  clangpp_exec_name = clang_exec_name
+  if "clang++" not in clang_exec_name:
+    clangpp_exec_name = clang_exec_name.replace("clang", "clang++")
+  clangpp_path = clang_path.parent / clangpp_exec_name
+  if not clangpp_path.exists():
+    raise FileNotFoundError(
+      f"Failed to get clang++ path from clang path: '{clang_path!s}'. "
+      f"Tried the path: '{clangpp_path!s}'."
+    )
+  return str(clangpp_path)
+
 def get_gcc_major_version(gcc_path: str):
   gcc_version_proc = subprocess.run(
     [gcc_path, "-dumpversion"],
diff --git a/jaxlib/jax.bzl b/jaxlib/jax.bzl
index 1cc4fab12..93e9ebacf 100644
--- a/jaxlib/jax.bzl
+++ b/jaxlib/jax.bzl
@@ -76,9 +76,9 @@ _CPU_PYPI_WHEEL_DEPS = [
     "@pypi_jaxlib//:pkg",
 ]
 
-# TODO(vam): remove this once zstandard builds against Python 3.13
+# TODO(vam): remove this once zstandard builds against Python >3.13
 def get_zstandard():
-    if HERMETIC_PYTHON_VERSION == "3.13" or HERMETIC_PYTHON_VERSION == "3.13-ft":
+    if HERMETIC_PYTHON_VERSION in ("3.13", "3.13-ft", "3.14", "3.14-ft"):
         return []
     return ["@pypi_zstandard//:pkg"]