diff --git a/api-book/requirements.txt b/api-book/requirements.txt
index 413724e..84326a0 100644
--- a/api-book/requirements.txt
+++ b/api-book/requirements.txt
@@ -105,7 +105,7 @@ tornado==6.1
 traitlets==4.3.3
 typing-extensions==3.7.4.3
 uc-micro-py==1.0.1
-urllib3==1.26.3
+urllib3==1.26.5
 vega-datasets==0.9.0
 wcwidth==0.2.5
 webencodings==0.5.1