diff --git a/esptool.py b/esptool.py
index b40c0b951..be178d124 100755
--- a/esptool.py
+++ b/esptool.py
@@ -33,7 +33,7 @@
 import time
 
 
-__version__ = "1.3-dev"
+__version__ = "1.3"
 
 PYTHON2 = sys.version_info[0] < 3  # True if on pre-Python 3
 
diff --git a/setup.py b/setup.py
index edc7a6df6..a2a831151 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@ def find_version(*file_paths):
 
   $ pip install --upgrade esptool
 
-(esptool.py requires Python 2. If your default pip version is Python 3, install via ``pip2 install esptool``.)
+Since version 1.3, esptool supports both Python 2.7 and Python 3.4 or newer.
 
 Usage
 -----
@@ -77,6 +77,9 @@ def find_version(*file_paths):
         'Environment :: Console',
         'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
     ],
     tests_require=[
         'flake8>=3.2.0',