diff --git a/requirements-dev.txt b/requirements-dev.txt
index 3f04a36..042a18a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -44,7 +44,7 @@
     #   -r https://osm.etsi.org/gitweb/?p=osm/N2VC.git;a=blob_plain;f=requirements.txt;hb=master
     #   cryptography
     #   pynacl
-charset-normalizer==3.0.1
+charset-normalizer==2.1.1
     # via
     #   -r https://osm.etsi.org/gitweb/?p=osm/N2VC.git;a=blob_plain;f=requirements.txt;hb=master
     #   requests