diff --git a/tests/requirements.txt b/tests/requirements.txt
index 4857f4bb..f232c22b 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -17,3 +17,6 @@ django
 requests
 gevent
 flask
+
+# https://github.com/microsoft/debugpy/issues/1126
+greenlet==1.1.3