diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..8fa5b33
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1 @@
+env
\ No newline at end of file
diff --git a/etc/reqs.txt b/etc/reqs.txt
index 43c65f9..c2dfb1a 100644
--- a/etc/reqs.txt
+++ b/etc/reqs.txt
@@ -1 +1 @@
-feedgen==0.3.1
+feedgen>=0.3.1
diff --git a/feedgen/ext/i2p.py b/feedgen/ext/i2p.py
index 39c8bf6..d40644e 100644
--- a/feedgen/ext/i2p.py
+++ b/feedgen/ext/i2p.py
@@ -69,7 +69,7 @@ class Release(object):
         if self.__release_min_java_version is not None:
             release.attrib['minJavaVersion'] = self.__release_min_java_version
 
-        for update_type, update in self.__release_updates.iteritems():
+        for update_type, update in self.__release_updates.items():
             update_node = etree.SubElement(release, '{%s}update' % I2P_NS)
             update_node.attrib['type'] = update_type
 
@@ -116,7 +116,7 @@ class Release(object):
             raise ValueError('update_type must be one of sud, su2 or su3')
         if update is None:
             update = Update()
-        if self.__release_updates.has_key(update_type) and not replace:
+        if update_type in self.__release_updates and not replace:
             raise ValueError('Update type %s is already defined' % update_type)
         self.__release_updates[update_type] = update
         return update
@@ -159,7 +159,7 @@ class Revocations(object):
 
         revocations = etree.Element('{%s}revocations' % I2P_NS)
 
-        for crl_id, crl in self.__revocations_crls.iteritems():
+        for crl_id, crl in self.__revocations_crls.items():
             crl_node = etree.SubElement(revocations, '{%s}crl' % I2P_NS)
             crl_node.attrib['id'] = crl_id
             crl_node.attrib['updated'] = crl.updated().isoformat()
@@ -170,7 +170,7 @@ class Revocations(object):
     def add_crl(self, crl_id, crl=None, replace=False):
         if crl is None:
             crl = Crl()
-        if self.__revocations_crls.has_key(crl_id) and not replace:
+        if crl_id in self.__revocations_crls and not replace:
             raise ValueError('CRL ID %s is already defined' % crl_id)
         self.__revocations_crls[crl_id] = crl
         return crl
diff --git a/generate_news.py b/generate_news.py
index a646cab..7035bd5 100755
--- a/generate_news.py
+++ b/generate_news.py
@@ -29,7 +29,7 @@ def load_entries(fg, entries_file):
     with open(entries_file) as f:
         entries_data = f.read().decode('utf8').strip('\n')
         # Replace HTML non-breaking space with unicode
-        entries_data = entries_data.replace(' ', u'\u00a0')
+        entries_data = entries_data.replace(' ', '\u00a0')
         # Strip the leading <div> from translations
         if entries_data.startswith('<div>'):
             entries_data = entries_data[5:]
@@ -66,22 +66,22 @@ def load_releases(fg):
             r = fg.i2p.add_release()
             r.date(release['date'])
             r.version(release['version'])
-            if release.has_key('minVersion'):
+            if 'minVersion' in release:
                 r.min_version(release['minVersion'])
-            if release.has_key('minJavaVersion'):
+            if 'minJavaVersion' in release:
                 r.min_java_version(release['minJavaVersion'])
 
-            for update_type, update in release['updates'].iteritems():
+            for update_type, update in release['updates'].items():
                 u = r.add_update(update_type)
-                if update.has_key('clearnet'):
+                if 'clearnet' in update:
                     for url in update['clearnet']:
                         u.clearnet(url)
-                if update.has_key('clearnetssl'):
+                if 'clearnetssl' in update:
                     for url in update['clearnetssl']:
                         u.clearnetssl(url)
-                if update.has_key('torrent'):
+                if 'torrent' in update:
                     u.torrent(update['torrent'])
-                if update.has_key('url'):
+                if 'url' in update:
                     for url in update['url']:
                         u.url(url)
 
diff --git a/setup.py b/setup.py
index 9fa8f44..95b57de 100644
--- a/setup.py
+++ b/setup.py
@@ -9,6 +9,6 @@ setup(
     description='I2P Atom extension for feedgen',
     author='str4d',
 
-    install_requires="feedgen==0.3.1",
+    install_requires="feedgen>=0.3.1",
     packages=['feedgen.ext'],
 )
diff --git a/setup_venv.sh b/setup_venv.sh
index 6897245..36b7b14 100755
--- a/setup_venv.sh
+++ b/setup_venv.sh
@@ -7,7 +7,7 @@ if [ ! $venv ]; then
     exit 1
 else
     if [ ! -d $venv_dir ] ; then
-        if $venv --version | grep '[2-9][0-9].0.*'; then
+        if $venv --version | awk -F: '{if($2>20)print$2}' ; then
             $venv $venv_dir
         else
             $venv --distribute $venv_dir