diff --git a/.nanvix/docker.py b/.nanvix/docker.py
index d7dbc86747..92d8f54ddb 100644
--- a/.nanvix/docker.py
+++ b/.nanvix/docker.py
@@ -320,6 +320,15 @@ def _generate_setup_local_cmd() -> str:
         f"'_statistics _statisticsmodule.c' "
         f"'mmap mmapmodule.c' "
         f"'_contextvars _contextvarsmodule.c' "
+        f"'# Phase 1C: Tier-1 text codecs (pure C, no external deps).' "
+        f"'unicodedata unicodedata.c' "
+        f"'_multibytecodec cjkcodecs/multibytecodec.c' "
+        f"'_codecs_cn cjkcodecs/_codecs_cn.c' "
+        f"'_codecs_hk cjkcodecs/_codecs_hk.c' "
+        f"'_codecs_iso2022 cjkcodecs/_codecs_iso2022.c' "
+        f"'_codecs_jp cjkcodecs/_codecs_jp.c' "
+        f"'_codecs_kr cjkcodecs/_codecs_kr.c' "
+        f"'_codecs_tw cjkcodecs/_codecs_tw.c' "
         f"> {ws}/Modules/Setup.local"
     )
 
diff --git a/.nanvix/test.py b/.nanvix/test.py
index 836a947b29..367687d0a9 100644
--- a/.nanvix/test.py
+++ b/.nanvix/test.py
@@ -488,6 +488,27 @@ def stage(
         "    print(f'CPYTHON_TEST_PHASE1A: {_name} loaded via dlopen from "
         "{_mod.__file__}')\n"
     )
+    # Phase 1C: Tier-1 text-codec modules (CJK + unicodedata). No
+    # external deps; resolve against python.elf's .dynsym via dlopen.
+    phase1c_snippet = (
+        "_phase1c = [\n"
+        "    ('unicodedata', lambda m: m.lookup('LATIN SMALL LETTER A') == 'a'),\n"
+        "    ('_multibytecodec', lambda m: hasattr(m, '__create_codec')),\n"
+        "    ('_codecs_cn', lambda m: hasattr(m, 'getcodec')),\n"
+        "    ('_codecs_hk', lambda m: hasattr(m, 'getcodec')),\n"
+        "    ('_codecs_iso2022', lambda m: hasattr(m, 'getcodec')),\n"
+        "    ('_codecs_jp', lambda m: hasattr(m, 'getcodec')),\n"
+        "    ('_codecs_kr', lambda m: hasattr(m, 'getcodec')),\n"
+        "    ('_codecs_tw', lambda m: hasattr(m, 'getcodec')),\n"
+        "]\n"
+        "for _name, _check in _phase1c:\n"
+        "    _mod = __import__(_name)\n"
+        "    assert _name not in sys.builtin_module_names, "
+        "f'{_name} still built-in!'\n"
+        "    assert _check(_mod), f'{_name} sanity check failed'\n"
+        "    print(f'CPYTHON_TEST_PHASE1C: {_name} loaded via dlopen from "
+        "{_mod.__file__}')\n"
+    )
     # Phase 1B: Tier-1 math + memory modules. Same dlopen flow; libm
     # symbols are pulled from python.elf via --whole-archive.
     phase1b_snippet = (
@@ -526,6 +547,7 @@ def stage(
         + array_snippet
         + phase1a_snippet
         + phase1b_snippet
+        + phase1c_snippet
         + (lxml_snippet if standalone else ""),
     )