diff --git a/backend/requirements-min.txt b/backend/requirements-min.txt
index bc4732fc1d..04befcf8c1 100644
--- a/backend/requirements-min.txt
+++ b/backend/requirements-min.txt
@@ -47,4 +47,5 @@ fake-useragent==2.2.0
 
 chromadb==1.1.0
 black==25.9.0
-pydub
\ No newline at end of file
+pydub
+chardet==5.2.0
diff --git a/backend/requirements.txt b/backend/requirements.txt
index db32255a89..999818f7a4 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -59,6 +59,7 @@ pyarrow==20.0.0 # fix: pin pyarrow version to 20 for rpi compatibility #15897
 einops==0.8.1 
 
 ftfy==6.2.3
+chardet==5.2.0
 pypdf==6.0.0
 fpdf2==2.8.2
 pymdown-extensions==10.14.2
diff --git a/pyproject.toml b/pyproject.toml
index 85a8044e3c..fb797a72cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,6 +67,7 @@ dependencies = [
     "einops==0.8.1",
 
     "ftfy==6.2.3",
+    "chardet==5.2.0",
     "pypdf==6.0.0",
     "fpdf2==2.8.2",
     "pymdown-extensions==10.14.2",