diff --git a/requirements.txt b/requirements.txt
index 917d390..bebe004 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ requests==2.21.0
 rlp==1.1.0
 six==1.12.0
 toolz==0.9.0
-urllib3==1.24.1
+urllib3==1.26.5
 waitress==1.2.1
 web3==4.8.3
 websockets==6.0