diff --git a/mdl-ref-server/requirements.txt b/mdl-ref-server/requirements.txt
index d8583aab3..9af021444 100644
--- a/mdl-ref-server/requirements.txt
+++ b/mdl-ref-server/requirements.txt
@@ -13,4 +13,4 @@ PyYAML==5.4.1
 requests==2.31.0
 shellescape==3.8.1
 tornado==6.3.3
-urllib3==1.26.17
+urllib3==1.26.18