diff --git a/README.md b/README.md
index 4df7afd..cca479b 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ Additional functionality over standard kippo:
 Software required:
 
 * An operating system (tested on Debian, CentOS, FreeBSD and Windows 7)
-* Python 2.5+
+* Python 2.7+
 * Twisted 8.0+
 * PyCrypto
 * pyasn1
diff --git a/cowrie/commands/curl.py b/cowrie/commands/curl.py
index b745aca..b20fd0c 100644
--- a/cowrie/commands/curl.py
+++ b/cowrie/commands/curl.py
@@ -209,11 +209,11 @@ class HTTPProgressDownloader(client.HTTPDownloader):
     def gotHeaders(self, headers):
         if self.status == '200':
             #self.curl.writeln('200 OK')
-            if headers.has_key('content-length'):
+            if 'content-length' in headers:
                 self.totallength = int(headers['content-length'][0])
             else:
                 self.totallength = 0
-            if headers.has_key('content-type'):
+            if 'content-type' in headers:
                 self.contenttype = headers['content-type'][0]
             else:
                 self.contenttype = 'text/whatever'
diff --git a/cowrie/commands/wget.py b/cowrie/commands/wget.py
index 1ae9044..6736297 100644
--- a/cowrie/commands/wget.py
+++ b/cowrie/commands/wget.py
@@ -215,11 +215,11 @@ class HTTPProgressDownloader(client.HTTPDownloader):
         if self.status == '200':
             if self.quiet == False:
                 self.wget.writeln('200 OK')
-            if headers.has_key('content-length'):
+            if 'content-length' in headers:
                 self.totallength = int(headers['content-length'][0])
             else:
                 self.totallength = 0
-            if headers.has_key('content-type'):
+            if 'content-type' in headers:
                 self.contenttype = headers['content-type'][0]
             else:
                 self.contenttype = 'text/whatever'
diff --git a/twisted/plugins/cowrie_plugin.py b/twisted/plugins/cowrie_plugin.py
index 7ab8729..206c3d8 100644
--- a/twisted/plugins/cowrie_plugin.py
+++ b/twisted/plugins/cowrie_plugin.py
@@ -32,7 +32,7 @@ class CowrieServiceMaker(object):
         """
 
         if os.name == 'posix' and os.getuid() == 0:
-            print 'ERROR: You must not run cowrie as root!'
+            print('ERROR: You must not run cowrie as root!')
             sys.exit(1)
 
         cfg = readConfigFile(options["config"])