diff --git a/CHANGES.rst b/CHANGES.rst
index bad660963..a979e8411 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
 Changes
 =======
 
+**2017-04-17**
+
+*Released 5.3.1*
+
+- Hotfix release due to bug introduced by urllib3 version 1.21
+
 **2016-12-11**
 
 *Released 5.3*
diff --git a/docs/source/conf.py b/docs/source/conf.py
index d21602995..aa4fa8e44 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -61,7 +61,7 @@ author = u'Leandro Toledo'
 # The short X.Y version.
 version = '5.3'  # telegram.__version__[:3]
 # The full version, including alpha/beta/rc tags.
-release = '5.3.0'  # telegram.__version__
+release = '5.3.1'  # telegram.__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/requirements.txt b/requirements.txt
index d0e4645c6..dd00816b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 future>=0.15.2
-urllib3>=1.10
+urllib3==1.20
 certifi
diff --git a/telegram/version.py b/telegram/version.py
index 71ea39f5d..650e50c21 100644
--- a/telegram/version.py
+++ b/telegram/version.py
@@ -17,4 +17,4 @@
 # You should have received a copy of the GNU Lesser Public License
 # along with this program.  If not, see [http://www.gnu.org/licenses/].
 
-__version__ = '5.3.0'
+__version__ = '5.3.1'