diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c0938be2..828a738e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+## 0.6.6-dev1
+
+### Enhancements
+
+### Features
+
+### Fixes
+
+* fix: fileutils/file_type check json and eml decode ignore error
+
 ## 0.6.6-dev0
 
 ### Enhancements
diff --git a/test_unstructured/file_utils/test_filetype.py b/test_unstructured/file_utils/test_filetype.py
index fee59fd33..9985280db 100644
--- a/test_unstructured/file_utils/test_filetype.py
+++ b/test_unstructured/file_utils/test_filetype.py
@@ -10,6 +10,7 @@ from unstructured.file_utils.filetype import (
     DOCX_MIME_TYPES,
     XLSX_MIME_TYPES,
     FileType,
+    _is_text_file_a_json,
     detect_filetype,
 )
 
@@ -285,3 +286,16 @@ def test_detect_filetype_raises_with_none_specified():
 
 def test_filetype_order():
     assert FileType.HTML < FileType.XML
+
+
+@pytest.mark.parametrize(
+    ("content", "expected"),
+    [
+        (b"d\xe2\x80", False),
+    ],
+)
+def test_is_text_file_a_json(content, expected):
+    from io import BytesIO
+
+    with BytesIO(content) as f:
+        assert _is_text_file_a_json(file=f) == expected
diff --git a/unstructured/__version__.py b/unstructured/__version__.py
index d7d6a9bd3..490af064a 100644
--- a/unstructured/__version__.py
+++ b/unstructured/__version__.py
@@ -1 +1 @@
-__version__ = "0.6.6-dev0"  # pragma: no cover
+__version__ = "0.6.6-dev1"  # pragma: no cover
diff --git a/unstructured/file_utils/filetype.py b/unstructured/file_utils/filetype.py
index 05e6e1ce7..6a18177f4 100644
--- a/unstructured/file_utils/filetype.py
+++ b/unstructured/file_utils/filetype.py
@@ -352,7 +352,7 @@ def _is_text_file_a_json(
         if isinstance(file_content, str):
             file_text = file_content
         else:
-            file_text = file_content.decode()
+            file_text = file_content.decode(errors="ignore")
         file.seek(0)
     elif filename is not None:
         with open(filename) as f:
@@ -367,7 +367,7 @@ def _check_eml_from_buffer(file: IO) -> bool:
     file.seek(0)
     file_content = file.read(4096)
     if isinstance(file_content, bytes):
-        file_head = file_content.decode("utf-8")
+        file_head = file_content.decode("utf-8", errors="ignore")
     else:
         file_head = file_content