diff --git a/doc/sphinx/requirements.txt b/doc/sphinx/requirements.txt
index 88a7838..cf49d5d 100644
--- a/doc/sphinx/requirements.txt
+++ b/doc/sphinx/requirements.txt
@@ -36,5 +36,5 @@ sphinxcontrib-htmlhelp==1.0.3
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.4
-urllib3==1.26.5
+urllib3==1.26.18