diff --git a/gertty/sync.py b/gertty/sync.py
index f036bbd..704856a 100644
--- a/gertty/sync.py
+++ b/gertty/sync.py
@@ -841,6 +841,9 @@ class Sync(object):
         self.log = logging.getLogger('gertty.sync')
         self.queue = MultiQueue([HIGH_PRIORITY, NORMAL_PRIORITY, LOW_PRIORITY])
         self.result_queue = Queue.Queue()
+        # Disable InsecureRequestWarning when certificate validation is disabled
+        if not self.app.config.verify_ssl:
+            requests.packages.urllib3.disable_warnings()
         self.session = requests.Session()
         if self.app.config.auth_type == 'basic':
             authclass = requests.auth.HTTPBasicAuth