diff --git a/requirements.txt b/requirements.txt
index e03bcc71..9aa55dba 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,6 @@ certifi >= 14.05.14
 six
 python_dateutil >= 2.5.3
 setuptools >= 21.0.0
-urllib3 >= 1.15.1, <= 1.22
+urllib3 >= 1.23
 pycryptodome >= 3.6.1
 requests
diff --git a/setup.py b/setup.py
index ff95c2f1..41694dc1 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
 # prerequisite: setuptools
 # http://pypi.python.org/pypi/setuptools
 
-REQUIRES = ["pycryptodome >= 3.6.1", "urllib3 >= 1.15, <= 1.22", "six", "certifi", "python-dateutil", "requests"]
+REQUIRES = ["pycryptodome >= 3.6.1", "urllib3 >= 1.23", "six", "certifi", "python-dateutil", "requests"]
 
 setup(
     name=NAME,