diff --git a/cryptopt/requirements.txt b/cryptopt/requirements.txt
index 04d8934..c690190 100644
--- a/cryptopt/requirements.txt
+++ b/cryptopt/requirements.txt
@@ -16,4 +16,4 @@ retrying==1.3.3
 scipy==1.2.1
 six==1.12.0
 traitlets==4.3.2
-urllib3==1.24.1
+urllib3==1.26.5