diff --git a/pyproject.toml b/pyproject.toml
index a9fb2cc..52a13b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ dependencies = [
     "python-pptx>=1.0.2",
     "pypdf>=6.4.2",
     "regex>=2025.11.3",
+    "charset-normalizer>=3.4.4",
 ]
 dynamic = ["version"]
 
diff --git a/uv.lock b/uv.lock
index 5701b8e..ff2874d 100644
--- a/uv.lock
+++ b/uv.lock
@@ -370,6 +370,7 @@ name = "docutranslate"
 source = { editable = "." }
 dependencies = [
     { name = "beautifulsoup4" },
+    { name = "charset-normalizer" },
     { name = "fastapi", extra = ["standard"] },
     { name = "httpx" },
     { name = "json-repair" },
@@ -405,6 +406,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "beautifulsoup4", specifier = ">=4.13.4" },
+    { name = "charset-normalizer", specifier = ">=3.4.4" },
     { name = "docling", marker = "extra == 'docling'", specifier = ">=2.40.0" },
     { name = "fastapi", extras = ["standard"], specifier = ">=0.115.12" },
     { name = "hf-xet", marker = "extra == 'docling'", specifier = ">=1.1.10" },