diff -up ./setup.py.orig ./setup.py
--- ./setup.py.orig	2019-01-30 23:18:36.000000000 +0100
+++ ./setup.py	2019-02-04 23:50:40.090594061 +0100
@@ -13,7 +13,7 @@ deps = [
     'futures;python_version<"3.0"',
     # Require singledispatch on Python <3.4
     'singledispatch;python_version<"3.4"',
-    "requests>=2.21.0,<3.0",
+    "requests>=2.20.0,<3.0",
     'urllib3[secure]>=1.23;python_version<"3.0"',
     "isodate",
     "websocket-client",