diff --git a/lira/lira.py b/lira/lira.py
index 9bba9d26..9a6f13c5 100755
--- a/lira/lira.py
+++ b/lira/lira.py
@@ -12,6 +12,9 @@
 This listener API Lira listens for notifications and start workflows.
 """
 import os
+import gevent
+import gevent.socket
+import socket
 import json
 import logging
 import connexion
@@ -64,6 +67,13 @@
     'lira_api.yml', resolver=resolver, validate_responses=True, arguments=arguments
 )
 
+# Patch GRPC (used by Google PubSub) to be gevent-compatible: https://github.com/grpc/grpc/issues/4629
+if socket.socket is gevent.socket.socket:
+    logger.info("Patching GRPC for use with gevent...")
+    import grpc.experimental.gevent
+
+    grpc.experimental.gevent.init_gevent()
+
 
 if __name__ == '__main__':
     app.run(host=args.host, port=args.port)
diff --git a/requirements.txt b/requirements.txt
index 54b99bba..fc4d81ca 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,9 @@
 wheel==0.32.3
 connexion[swagger-ui]==2.2.0
-google-auth==1.5.0
+google-auth==1.7.1
 google-cloud-storage==1.9.0
 flask>=1.0.0
-gunicorn==19.9.0
+gunicorn==20.0.4
 gevent==1.4.0
 requests==2.20.0
 requests-mock==1.5.0
@@ -14,5 +14,5 @@ cromwell-tools>=1.1.1, <2
 black==19.3b0
 flake8==3.7.7
 pre-commit==1.14.4
-google-cloud-pubsub==0.39.1
+google-cloud-pubsub==1.0.2
 git+git://github.com/HumanCellAtlas/pipeline-tools@v0.58.0