diff --git a/requirements_dev.txt b/requirements_dev.txt
index 2103afa450280f65e8c1cc153c4edd60a81245ee..4abb5acec55aab6af94cc7d553fc4d4afce0913a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -20,3 +20,6 @@ timeout-decorator>=0.4.1
 attrs
 ushlex
 gym==0.14.0
+flask
+flask_cors
+flask_socketio