diff --git a/examples/wsgi/django_example/requirements.txt b/examples/wsgi/django_example/requirements.txt
index 0ef528d..42f0edd 100644
--- a/examples/wsgi/django_example/requirements.txt
+++ b/examples/wsgi/django_example/requirements.txt
@@ -1,8 +1,8 @@
-Django==1.11.1
+django==2.1.3
 enum-compat==0.0.2
 eventlet==0.21.0
 greenlet==0.4.12
 python-engineio
 python-socketio
-pytz==2017.2
+pytz==2018.7
 six==1.10.0
diff --git a/examples/wsgi/requirements.txt b/examples/wsgi/requirements.txt
index b704e5b..240fa2e 100644
--- a/examples/wsgi/requirements.txt
+++ b/examples/wsgi/requirements.txt
@@ -1,15 +1,15 @@
-click==6.7
+Click-7.0
 enum-compat==0.0.2
 enum34==1.1.6
 eventlet==0.20.1
-Flask==0.12
+Flask==1.0.2
 greenlet==0.4.12
-itsdangerous==0.24
-Jinja2==2.9.5
-MarkupSafe==0.23
+itsdangerous==1.1.0
+Jinja2==2.10
+MarkupSafe==1.1.0
 packaging==16.8
 pyparsing==2.1.10
 python-engineio
 python-socketio
-six==1.10.0
-Werkzeug==0.11.15
+six==1.11.0
+Werkzeug==0.14.1
diff --git a/socketio/zmq_manager.py b/socketio/zmq_manager.py
index 468830b..f2a2ae5 100644
--- a/socketio/zmq_manager.py
+++ b/socketio/zmq_manager.py
@@ -57,7 +57,7 @@ class ZmqManager(PubSubManager):  # pragma: no cover
                                '(Run "pip install pyzmq" in your '
                                'virtualenv).')
 
-        r = re.compile(':\d+\+\d+$')
+        r = re.compile(r':\d+\+\d+$')
         if not (url.startswith('zmq+tcp://') and r.search(url)):
             raise RuntimeError('unexpected connection string: ' + url)