diff --git a/requirement_dev.txt b/requirement_dev.txt
index bb4b154..e081f51 100644
--- a/requirement_dev.txt
+++ b/requirement_dev.txt
@@ -15,5 +15,5 @@ pytest==3.6.3
 python-chatfuel-class==2.1.3
 requests==2.19.1
 six==1.11.0
-urllib3==1.23
+urllib3==1.26.5
 Werkzeug==0.14.1