diff --git a/examples/server/wsgi/requirements.txt b/examples/server/wsgi/requirements.txt
index 3026d7f..f4b7113 100644
--- a/examples/server/wsgi/requirements.txt
+++ b/examples/server/wsgi/requirements.txt
@@ -1,7 +1,7 @@
 Click==7.0
 enum-compat==0.0.2
 enum34==1.1.6
-eventlet==0.35.2
+eventlet==0.40.3
 Flask==1.0.2
 greenlet==0.4.12
 itsdangerous==1.1.0