diff --git a/requirements.txt b/requirements.txt
index 8a5c4744..576a6522 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,6 +47,7 @@ attrs
 importlib-metadata
 numpy
 pillow
+charset-normalizer
 git+https://github.com/accessibleapps/libloader
 git+https://github.com/accessibleapps/platform_utils
 git+https://github.com/accessibleapps/accessible_output2