diff --git a/docs/pyMCell/requirements.txt b/docs/pyMCell/requirements.txt
index 87036af85..472f2fcca 100644
--- a/docs/pyMCell/requirements.txt
+++ b/docs/pyMCell/requirements.txt
@@ -18,4 +18,4 @@ Sphinx==1.7.0
 sphinx-autodoc-typehints==1.2.5
 sphinx-rtd-theme==0.2.4
 sphinxcontrib-websupport==1.0.1
-urllib3==1.22
+urllib3==1.26.5