diff --git a/tei2json/requirements.txt b/tei2json/requirements.txt
index dbb06c7..bead5b8 100644
--- a/tei2json/requirements.txt
+++ b/tei2json/requirements.txt
@@ -83,7 +83,7 @@ text-unidecode==1.3
 tornado==6.0.4
 traitlets==4.3.3
 ujson==1.35
-urllib3==1.25.7
+urllib3==1.26.5
 uvicorn==0.11.7
 uvloop==0.14.0
 wcwidth==0.1.9