diff --git a/diawi-cli b/diawi-cli
index 3398a7a..7c5781d 100755
--- a/diawi-cli
+++ b/diawi-cli
@@ -8,6 +8,7 @@ import random
 import string
 import urllib
 import urllib2
+import sys
 
 handler=urllib2.HTTPHandler(debuglevel=1)
 opener = urllib2.build_opener(handler)
@@ -23,6 +24,14 @@ from httplib import HTTPConnection, HTTPS_PORT
 import ssl
 import socket
 
+def is_supported_version():
+    try:
+        ssl.PROTOCOL_TLSv1_2
+    except AttributeError:
+        return False
+    else:
+        return True
+
 class HTTPSConnection(HTTPConnection):
     "This class allows communication via SSL."
     default_port = HTTPS_PORT
@@ -74,6 +83,12 @@ def response_to_json(response):
 
     return json.loads(responseStr)
 
+if not is_supported_version():
+    print "ERROR: This script requires a Python interpreter with TLS v1.2 support, which was added in Python 2.7.9.  Please \
+upgrade your Python interpreter, or recompile with TLS v1.2 support.  Note that version of Python shipped with Mac OS \
+X El Capitan is nominally 2.7.10, but is missing TLS v1.2 support.  Exiting."
+    exit(1)
+
 parser = argparse.ArgumentParser()
 parser.add_argument("filename",   help="The .ipa file to deploy.")
 parser.add_argument("-c", "--comment",  help="Comment to display to the installer")