diff --git a/tei2json/requirements.txt b/tei2json/requirements.txt
index dbb06c7..c855d37 100644
--- a/tei2json/requirements.txt
+++ b/tei2json/requirements.txt
@@ -88,5 +88,5 @@ uvicorn==0.11.7
 uvloop==0.14.0
 wcwidth==0.1.9
 webencodings==0.5.1
-websockets==8.1
+websockets==9.1
 widgetsnbextension==3.5.1