diff --git a/IBPSA/Resources/src/fluid/heatpumps/calibration/doc/requirements.txt b/IBPSA/Resources/src/fluid/heatpumps/calibration/doc/requirements.txt
index fc8606564a..cfa11751d9 100644
--- a/IBPSA/Resources/src/fluid/heatpumps/calibration/doc/requirements.txt
+++ b/IBPSA/Resources/src/fluid/heatpumps/calibration/doc/requirements.txt
@@ -28,4 +28,4 @@ sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-plantuml==0.22
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-urllib3==1.26.17
+urllib3==1.26.18