diff --git a/tests/docs/books/visualization-curriculum/requirements.txt b/tests/docs/books/visualization-curriculum/requirements.txt
index 3b51925695f..a0b6b639275 100644
--- a/tests/docs/books/visualization-curriculum/requirements.txt
+++ b/tests/docs/books/visualization-curriculum/requirements.txt
@@ -68,7 +68,7 @@ testpath==0.4.4
 toolz==0.11.1
 tornado==6.1
 traitlets==5.0.5
-urllib3==1.26.4
+urllib3==1.26.18
 vega-datasets==0.9.0
 wcwidth==0.2.5
 webencodings==0.5.1