diff --git a/.github/workflows/build_and_upload.yml b/.github/workflows/build_and_upload.yml
index cd25f0f..a8b2f3d 100644
--- a/.github/workflows/build_and_upload.yml
+++ b/.github/workflows/build_and_upload.yml
@@ -19,16 +19,23 @@ jobs:
       - uses: "actions/checkout@v4"
         with:
           submodules: true
+      - name: "Set up QEMU"
+        if: matrix.os == 'ubuntu-latest'
+        uses: "docker/setup-qemu-action@v3"
+        with:
+          platforms: arm64
       - name: "Build wheels"
         uses: "pypa/cibuildwheel@v2.21.1"
         env:
           CIBW_SKIP: "pp*"  # FIXME
+          CIBW_ARCHS_LINUX: "auto aarch64"
           CIBW_TEST_REQUIRES: "pytest"
           CIBW_TEST_COMMAND: "pytest {project}/tests --doctest-modules"
-      - uses: "actions/upload-artifact@v3"
+      - uses: "actions/upload-artifact@v4"
         with:
           path: "./wheelhouse/*.whl"
-
+          name: wheel-${{ matrix.os }}
+ 
   make_sdist:
     name: "Build source distribution"
     runs-on: ubuntu-latest
@@ -38,9 +45,10 @@ jobs:
           submodules: true
       - name: "Build source distribution"
         run: "pipx run build --sdist"
-      - uses: "actions/upload-artifact@v3"
+      - uses: "actions/upload-artifact@v4"
         with:
           path: "./dist/*.tar.gz"
+          name: sdist
 
   upload_to_pypi:
     name: "Upload to PyPI"
@@ -50,11 +58,11 @@ jobs:
       - build_wheels
       - make_sdist
     steps:
-      - uses: "actions/download-artifact@v3"
+      - uses: "actions/download-artifact@v4"
         with:
-          name: artifact
           path: dist
-      - uses: "pypa/gh-action-pypi-publish@v1.8.10"
+          merge-multiple: true
+      - uses: "pypa/gh-action-pypi-publish@v1.13.0"
         with:
           user: __token__
           password: ${{ secrets.PYPI_TOKEN }}
diff --git a/pycrfsuite/_pycrfsuite.pyx b/pycrfsuite/_pycrfsuite.pyx
index 09cc379..647f203 100644
--- a/pycrfsuite/_pycrfsuite.pyx
+++ b/pycrfsuite/_pycrfsuite.pyx
@@ -1,6 +1,6 @@
 # cython: embedsignature=True
 # cython: c_string_type=str
-# cython: c_string_encoding=ascii
+# cython: c_string_encoding=utf-8
 # cython: profile=False
 # distutils: language=c++
 from . cimport crfsuite_api
diff --git a/pyproject.toml b/pyproject.toml
index 73c0598..b2dee39 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "python-crfsuite"
-version = "0.9.10"
+version = "0.9.11"
 description = "Python binding for CRFsuite"
 authors = [
   {name = "Terry Peng", email = "pengtaoo@gmail.com"},
diff --git a/setup.py b/setup.py
index 28363cb..ca958c4 100755
--- a/setup.py
+++ b/setup.py
@@ -6,8 +6,7 @@
 from Cython.Build import cythonize
 from setuptools import Extension, setup
 
-sources = ["pycrfsuite/_pycrfsuite.pyx",
-           "pycrfsuite/trainer_wrapper.cpp"]
+sources = ["pycrfsuite/_pycrfsuite.pyx", "pycrfsuite/trainer_wrapper.cpp"]
 
 # crfsuite
 sources += glob.glob("crfsuite/lib/crf/src/*.c")
@@ -34,10 +33,17 @@ def build_extensions(self):
         _compile = c._compile
 
         def c_compile(obj, src, ext, cc_args, extra_postargs, pp_opts):
+            cc_args = (
+                cc_args + ["-D_POSIX_C_SOURCE=200112L"]
+                if src.startswith("crfsuite/")
+                else cc_args
+            )
             cc_args = cc_args + ["-std=c99"] if src.endswith(".c") else cc_args
             return _compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
 
-        if c.compiler_type == "unix" and "gcc" in c.compiler:
+        if c.compiler_type == "unix" and any(
+            item == "gcc" or item.endswith("-gcc") for item in c.compiler
+        ):
             c._compile = c_compile
 
         elif self.compiler.compiler_type == "msvc":
@@ -58,5 +64,5 @@ def c_compile(obj, src, ext, cc_args, extra_postargs, pp_opts):
             )
         ]
     ),
-    cmdclass={"build_ext": build_ext_check_gcc}
+    cmdclass={"build_ext": build_ext_check_gcc},
 )
diff --git a/tests/conftest.py b/tests/conftest.py
index 446b357..60a19d7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -14,6 +14,7 @@ def xseq():
         {},
         {"clean": 1},
         {"солнце": "не светит".encode(), "clean": 1},
+        {"world": 2},
     ]
 
 
@@ -30,6 +31,7 @@ def yseq():
         "sunny",
         "rainy",
         "rainy",
+        "好",
     ]
 
 
diff --git a/tests/test_tagger.py b/tests/test_tagger.py
index 40c0218..3ebb021 100644
--- a/tests/test_tagger.py
+++ b/tests/test_tagger.py
@@ -177,11 +177,11 @@ def test_info(model_filename):
             > res.state_features[("walk", "rainy")]
         )
         assert ("солнце:не светит", "rainy") in res.state_features
-        assert res.header["num_labels"] == "2"
-        assert set(res.labels.keys()) == {"sunny", "rainy"}
-        assert set(res.attributes.keys()) == {
-            "shop", "walk", "clean", "солнце:не светит"
-        }
+        assert res.header["num_labels"] == "3"
+        assert set(res.labels.keys()) == set(["sunny", "rainy", "好"])
+        assert set(res.attributes.keys()) == set(
+            ["shop", "walk", "clean", "солнце:не светит", "world"]
+        )
 
     # it shouldn't segfault on a closed tagger
     with pytest.raises(RuntimeError):
@@ -227,13 +227,13 @@ def test_append_nested_dicts(tmpdir):
     with Tagger().open(model_filename) as tagger:
         info = tagger.info()
         assert set(info.attributes.keys()) == {
-                "foo:bar:baz",
-                "foo:spam",
-                "foo:egg:x",
-                "foo:egg:y",
-                "foo:ham:x",
-                "foo:ham:y",
-                "foo:bar:ham",
+            "foo:bar:baz",
+            "foo:spam",
+            "foo:egg:x",
+            "foo:egg:y",
+            "foo:ham:x",
+            "foo:ham:y",
+            "foo:bar:ham",
         }
 
         for feat in ["foo:bar:baz", "foo:spam", "foo:egg:x", "foo:egg:y"]: