diff --git a/setup.cfg b/setup.cfg
index 695d49e..0459486 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [options]
 install_requires =
-    flask==2.0.0
+    flask[async]==2.0.0
 
 [options.extras_require]
 # Used inside Tox for running tests