diff --git a/doc/requirements.txt b/doc/requirements.txt
index 1cf3d0a..6885b8c 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -32,4 +32,4 @@ sphinxcontrib-htmlhelp==2.0.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-urllib3==1.26.4
+urllib3==1.26.19